Export: a progress dialog with Cancel for background exports

While an export runs in the background (Background Export), a dialog shows
what is being exported and how far it has got: artboard by artboard for a
raster export of several artboards, busy otherwise. Cancel (also Esc) stops
it and writes no file; Continue in Background leaves it to the status bar.
It opens after 0.4 s and never over another dialog.

Built on the shared vectorcraft_doc::cancel (#2546): fileio::progress::Progress
wraps its CancelToken and a progress sink, so a cancelled export stops
drawing and keeps no half-drawn pattern tile or effect raster.

- ui: background jobs carry their Progress; export_progress draws the
  dialog; UI commands file.cancelExport and file.exportInBackground.
- i18n: the strings in every language with complete menus, Danish, Dutch
  and Indonesian included; "{n} more exports waiting" is a plural (trn).
- docs: ui-parity, gaps (G12) and ROADMAP rows.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Dt49z1ubK9x1bPq51APgz3

ROADMAP.md

@@ -9,7 +9,7 @@
 
 **Stage: alpha** · next: beta, ~13 points (ready for real work ~62% → ~75%, and reliable `.ai` exchange) and ~170–270 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-18 · **Change:** minor (about 40 community PRs of 2026-10-18: Word .docx placed as area type, CCITT Group 3 TIFF, Roman Hanging Punctuation, blend spines edited with the Anchor Point tool, shadows and glows in stack order, coloured 3D lights, a Dutch catalog completed; 3D lighting: one to ten colored lights, smooth colored Inflate, legacy white-light appearance preserved; surface batching and restored seam minimum; scores and estimates unchanged; about 145 community PRs of 2026-10-17: image-decode overflow guards, opaque floating panels, MCP export cancel and progress, editable Illustrator EPS import, scoped `doc_inspect`, Dutch, Danish and Indonesian, Simplified Chinese messages, screen-reader names; headline numbers unchanged; about 160 community PRs of 2026-10-15/16: PDF import crash fixes, Dimension tool, legacy `.ai` save, Intertwine, web pen input, Image Trace fixes, `.ai`/EPS/PDF import fidelity, Bulgarian, Greek, Swedish and Finnish catalogs; headline numbers unchanged) · **Target:** Adobe Illustrator 2026 (30.x)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-18 · **Change:** minor (Background Export progress dialog with Cancel, #2564; about 40 community PRs of 2026-10-18: Word .docx placed as area type, CCITT Group 3 TIFF, Roman Hanging Punctuation, blend spines edited with the Anchor Point tool, shadows and glows in stack order, coloured 3D lights, a Dutch catalog completed; 3D lighting: one to ten colored lights, smooth colored Inflate, legacy white-light appearance preserved; surface batching and restored seam minimum; scores and estimates unchanged; about 145 community PRs of 2026-10-17: image-decode overflow guards, opaque floating panels, MCP export cancel and progress, editable Illustrator EPS import, scoped `doc_inspect`, Dutch, Danish and Indonesian, Simplified Chinese messages, screen-reader names; headline numbers unchanged; about 160 community PRs of 2026-10-15/16: PDF import crash fixes, Dimension tool, legacy `.ai` save, Intertwine, web pen input, Image Trace fixes, `.ai`/EPS/PDF import fidelity, Bulgarian, Greek, Swedish and Finnish catalogs; headline numbers unchanged) · **Target:** Adobe Illustrator 2026 (30.x)
 
 VectorCraft is a clean-room, open-source, pure-Rust reimplementation of the Adobe Illustrator workflow. It runs
 on macOS, Windows, Linux, FreeBSD and the web (WASM), and agents can drive all of it over MCP, the CLI and a JSON
@@ -135,6 +135,7 @@ Ranked; detail in [docs/roadmap.md](docs/roadmap.md) and [docs/gaps.md](docs/gap
 | Date | What landed |
 |---|---|
 | 2026-10-18 | About 40 community PRs landed in one batch through the full gate, with our fixes on top. New: Word `.docx` files place as area type with their formatting (#2766), CCITT Group 3 TIFF files open (#2770), Paragraph panel menu › Roman Hanging Punctuation (#2775), the Anchor Point tool edits blend spine points and handles (#2643, fixes #2544), shadows and glows each draw from the art with the effects before them, without the old exponential cost (#2395), one to ten coloured lights in 3D effects (#2706), Artboard Options X and Y with a reference point (#2739), more Contextual Task Bar actions (#2471), Optical Margin Alignment for a whole thread (#2773), History panel Step Backward/Forward and Set History Limit (#2764), Edit › Undo and Redo name the step as the History panel does (#2774), bounding-box handles snap to the grid, pixels and guides (#2715), Ctrl/Cmd+A in the Artboards panel (#2761), Tabs panel menu items (#2742), Import Data Sets defines variables from header cells (#2736), a Linux option to use X11 when a pen is attached (#2717). Fidelity and robustness: variable fonts named by their default weight and fallback glyphs keep bold and italic (#2733, #2732), legacy `.ai` layer names in Windows Latin-1 (#2722), WMF window mapping (#2721), Magic Wand inside isolation (#2720), type values out of range in files are clamped (#2728, #2757), raster effects stay responsive in drags (#2745), exports and Save for Web report undecodable images (#2762, #2737, #2684), Windows-safe exported file names (#2738), a marquee skips a Shaper Group's originals (#2772). Languages: the Dutch catalog completed (#2730). Headline numbers unchanged (estimated). |
+| 2026-10-17 | Background Export shows a progress dialog: the file being exported, the artboard count and a bar, Cancel (Esc) and Continue in Background. It runs on the shared cancel token of #2546, so a cancelled export writes no file and keeps no half-drawn pattern tile or effect raster; translated in every language with complete menus (#2564). Headline numbers unchanged. |
 | 2026-10-17 | About 145 community PRs landed in six batches, each through the full gate, plus our fixes on top. Crashes and hostile input: an image's RGBA size is checked from its header before decoding, without overflowing, in the renderer, sampling, recoloring and Crop Image (#2442, #2468, #2407), PDF Add Around and huge art are clamped (#2440), graph axis labels past i64, `+` in hex colours and XML ids are handled (#2610, #2470, #2447), Document Raster Effects resolutions open in range (#2579), Batch names stay in their folder (#2504). Regressions: floating panel groups are opaque again while the docked card keeps its rounded corners (#2499), the Wayland pointer returns over panels (#2502). New: MCP cancels long exports, answers while one runs and reports progress (#2546), `doc_inspect` takes ids, kind and paging (#2543), raster export of a page rectangle (#2511), `text.create` returns bounds (#2478), PDF presets and ICC profiles persist (#2547), screen-reader names for widgets (#2611), Expand on Intertwine (#2622, fixes #2540), Duplicate/Copy/Cut of several artboards (#2567), print presets by name (#2607), TSV data sets (#2608), planar TIFF (#2598), Alt-click a swatch onto a gradient stop (#2623), Shift-click ranges in Links, Graphic Styles and Libraries (#2612, #2613, #2618), Space+Shift rotates the view (#2601), Presentation Mode keys (#2583), Small Caps and super/subscript buttons (#2508). Fidelity: editable vector art from Illustrator EPS (#2571), `.ai` Drop Shadow Darkness (#2513), overprint preview with Darken (#2514), Generic CMYK black round-trips (#2503), PNG sRGB chunk (#2519), kerning at a caret (#2518), tab widths in justified area type (#2487), Transform copies keep their own gradients (#2486), smooth Zig Zag (#2475), Live Corners round up to their neighbours (#2484), kerning across style runs (#2554), SVG letter spacing on justified lines (#2574), Dimension tool snapping (#2482), gradient chips (#2495), Transform panel flips and percentages (#2400, #2404). Later the same day: PostScript `.ps` and `.epsf` files open (#2461), EPS images with CCITTFax compression draw (#2445), Illustrator 3 EPS without layers (#2436), `.ai` type opacity and blend modes (#2420), envelope meshes and compound holes in `.ai` (#2410, #2444), CMYK image soft masks in PDF export (#2448), Show Transparency Grid saved with the document (#2488), Save Selection in the Layers panel menu (#2483), Character and Paragraph Reset Panel (#2479, #2438), Cmd/Ctrl+Shift double-click releases a guide (#2467), Shift+Enter keeps a field active (#2431), Shift keeps reshaped handles perpendicular (#2425), emptied type keeps its style (#2464), Smart Blur radius (#2443), freeform gradients recolour (#2397), mesh slivers (#2456), Recolor wheel handles in CMYK (#2454), and six Image Trace fixes (#2387, #2584, #2586–#2589). Fifth batch: Optical Margin Alignment (#2563), Window › Blend panel (#2573), graph column designs (#2406), Live Paint Gap Options (#2424), the SVG Interactivity panel (#2437), RTF placed as area type (#2524), the Touch Type tool (#2469), pattern fills expand into clipped tiles (#2616), Save and Export ask before replacing a file an added extension names (#2619), the Artboard tool's Control bar and Contextual Task Bar (#2559, #2556), Alt-click New Artboard for its options (#2496), Shift-click in Brushes (#2562), the Move dialog remembers the last move (#2542), PDF export uses the document's assigned profiles (#2536), Printer Setup opens the selected printer's preferences on Windows (#2577). Sixth batch: Effect › Artistic › Cutout, Neon Glow and Poster Edges (#2453), View › Rulers › Change to Global / Artboard Rulers (#2416), Symbol Options 9-slice guides (#2512), Create Gradient Mesh on an embedded image (#2538), Rotate View cursors and the Mac trackpad rotation gesture (#2594, #2644), choice parameters as dropdowns in the inline effect editor (#2582), Group Selection picks and moves one path of a compound path (part of #2441), Shift-click ranges in the Artboards panel (#2626), Lock Variables (#2631), a layer dropped under the last row goes to the bottom (#2632), and robustness work: huge selections draw bounded overlays (#2635, #2645, part of #2460), values out of range in presets and files are clamped (#2656), whole-number checks for counts (#2638, #2659), exports warn about overset type (#2628), symbol instances measured by their art (#2614), colour-managed Eyedropper in CMYK documents (#2664). Later: Effect › Rasterize (#2409), variable-font axis sliders in the Character panel (#2710), Image Trace Create Strokes on an exact distance transform with Guo–Hall thinning and a skeleton graph (#2703–#2705), Auto Color keeps rare colours (#2702), large images trace with a warning (#2700), a 1e9 pt input bound on Reshape Segment, Convert Anchor Point and the Pencil (#2709), task-bar Connect, Corner and Smooth for selected anchors (#2697), PDF 0 w strokes import as hairlines (#2696), threading text from theLine truncated
 | 2026-10-16 | Symbol Options › Export Type (Graphic or Movie Clip, default Movie Clip) with Registration; `symbol.options` / `symbol.list` (G5).
 | 2026-10-15 | Cursors: 36 more tool states get cursors of their own. Node editing follows the public manual (Direct Selection's anchor squares, Reshape Segment, Group Selection's plus, the arrow hollow on a snap, the Alt-copy arrowheads), the Anchor Point caret, the Curvature pen and Free Transform's side-shear arrows are drawn; Lasso, the freehand, symbolism and other tools borrow a drawn cursor until theirs is drawn. `crates/tools/src/cursors.toml` lists every cursor for whoever draws them, and `cargo xtask cursors` warns about one missing from it. Scores unchanged. |
@@ -183,6 +184,7 @@ The full pre-standard record of what landed is kept in [docs/roadmap.md](docs/ro
 | 2026-10-17 | minor | Colored Inflate: shared membrane normals and smooth RGB vector ramps replace flat polygon bands; channel groups are batched per solid-fill surface. White-light Inflate retains its original polygons, paint composition and seam joins; the 0.05 seam minimum is restored. Scores and hour estimates unchanged. |
 | 2026-10-16 | minor | 3D lighting: one to ten directional lights, a selectable light list, Add Light and Delete Light, independent settings and artboard gestures; ambient applied once and smooth RGB vector export; scores and hour estimates unchanged |
 | 2026-10-16 | minor | 3D lighting: opaque RGB Color for the shared directional light, with neutral ambient, preview/reset controls and smooth vector Revolve shading; scores and hour estimates unchanged |
+| 2026-10-17 | minor | Progress log row for the Background Export progress dialog (#2564); headline numbers unchanged. |
 | 2026-10-14 | minor | G11: open-path anchor Delete removes adjoining segments without bridging the gap; explicit Remove Anchors keeps its reconnect/refit behavior. Scores and hours unchanged. |
 | 2026-10-14 | minor | Document fonts register every explicitly supplied craft-fonts family after the existing Japanese, Arabic and Thai prefix; optional empty input remains supported. Headline scores and estimates are unchanged. |
 | 2026-10-14 | minor | Progress log rows for the later merges of 2026-10-14 (#1630–#1875 as listed there); headline numbers unchanged. |

crates/engine/src/cmd/fileio/mod.rs

@@ -40,6 +40,7 @@ pub mod pdf;
 mod pdfimport;
 pub mod pngtext;
 pub mod ppi;
+pub mod progress;
 pub mod psdread;
 mod save;
 mod screens;

crates/engine/src/cmd/fileio/progress.rs

@@ -0,0 +1,82 @@
+//! Progress and Cancel of an export running off the UI thread (Background Export), on the shared
+//! [`vectorcraft_doc::cancel`] mechanism.
+//!
+//! The frontend makes a [`Progress`], runs the export inside [`scope`] on its worker and reads the
+//! counts from the UI thread to draw them; its Cancel button calls [`Progress::cancel`]. Inside the
+//! scope the encoders that work in steps (raster formats: one artboard at a time) report each step
+//! through [`vectorcraft_doc::cancel::progress`] and stop at the next check once cancelled; the
+//! renderer stops drawing and keeps no half-drawn pattern tile or effect raster. Encoders that
+//! make one file in one go report nothing: the frontend shows them as busy and checks
+//! [`Progress::cancelled`] itself before writing, so a cancelled export never writes a file.
+
+use std::rc::Rc;
+use std::sync::Arc;
+use std::sync::atomic::{AtomicU64, Ordering};
+
+use vectorcraft_doc::cancel::{self, CancelToken, ProgressSink};
+
+/// How far an export has got, shared between the worker and the UI thread.
+#[derive(Debug, Default)]
+pub struct Progress {
+    token: CancelToken,
+    done: AtomicU64,
+    total: AtomicU64,
+}
+
+impl Progress {
+    pub fn new() -> Arc<Self> {
+        Arc::new(Self::default())
+    }
+
+    /// `(steps done, steps in all)`; `total` is 0 while the export can't say (one file made in one go).
+    pub fn counts(&self) -> (u64, u64) {
+        let total = self.total.load(Ordering::Relaxed);
+        (self.done.load(Ordering::Relaxed).min(total), total)
+    }
+
+    /// The share of the export done, 0 to 1; `None` while the export can't say.
+    pub fn fraction(&self) -> Option<f64> {
+        let (done, total) = self.counts();
+        (total > 0).then(|| done as f64 / total as f64)
+    }
+
+    /// Ask the export to stop: it writes nothing more, and a render under way stops drawing.
+    pub fn cancel(&self) {
+        self.token.cancel();
+    }
+
+    pub fn cancelled(&self) -> bool {
+        self.token.is_cancelled()
+    }
+}
+
+/// Run `f` with `progress`'s token in effect on this thread and the steps reported to it.
+pub fn scope<R>(progress: &Arc<Progress>, f: impl FnOnce() -> R) -> R {
+    let to = Arc::clone(progress);
+    let sink: ProgressSink = Rc::new(move |done, total, _| {
+        to.total.store(total, Ordering::Relaxed);
+        to.done.store(done, Ordering::Relaxed);
+    });
+    cancel::scope(&progress.token, Some(sink), f)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn a_raster_export_counts_its_artboards_and_stops_once_cancelled() {
+        let mut doc = vectorcraft_doc::Document::new(100.0, 100.0);
+        let second = doc.artboards[0].clone();
+        doc.artboards.push(second);
+        let p = Progress::new();
+        assert_eq!(p.fraction(), None, "nothing reported yet");
+        let png = scope(&p, || super::super::encode_all(&doc, "png", &serde_json::json!({"useArtboards": true})));
+        assert!(png.is_ok(), "{:?}", png.err());
+        assert_eq!(p.counts(), (1, 2), "the step under way when the last artboard started");
+        p.cancel();
+        let r = scope(&p, || super::super::encode_all(&doc, "png", &serde_json::json!({"useArtboards": true})));
+        assert!(matches!(r, Err(crate::EngineError::Cancelled)), "{:?}", r.err());
+        assert!(!cancel::is_cancelled(), "the scope ended");
+    }
+}

crates/ui-egui/src/background.rs

@@ -6,9 +6,11 @@
 //! It needs a thread-safe writer from the host ([`crate::Services::write_shared`], desktop);
 //! without one (the web, which downloads) the work runs at once, as with the preference off.
 
+use std::sync::Arc;
 use std::sync::mpsc::{Receiver, Sender, channel};
 
 use serde_json::{Value, json};
+use vectorcraft_engine::cmd::fileio::progress::Progress;
 use vectorcraft_engine::file_access::ScopeHandle;
 
 use crate::VectorcraftApp;
@@ -50,9 +52,24 @@ pub struct Job {
     pub label: String,
     /// The document the job reads (`DocState::uid`), if any.
     pub doc: Option<u64>,
+    /// How far an export has got, and its Cancel ([`crate::export_progress`] shows it).
+    pub progress: Option<Arc<Progress>>,
+    /// Continue in Background: the progress dialog no longer shows this job.
+    pub hidden: bool,
     then: Then,
 }
 
+impl Job {
+    pub fn id(&self) -> u64 {
+        self.id
+    }
+
+    /// Was the job cancelled (it writes nothing more; its result is still on its way)?
+    pub fn cancelled(&self) -> bool {
+        self.progress.as_ref().is_some_and(|p| p.cancelled())
+    }
+}
+
 /// The worker and the jobs it has not finished.
 #[derive(Default)]
 pub struct Background {
@@ -93,6 +110,26 @@ impl Background {
     pub fn busy_with(&self, uid: u64) -> bool {
         self.jobs.iter().any(|j| j.doc == Some(uid))
     }
+
+    /// Cancel every export in progress → how many there were.
+    pub fn cancel_exports(&mut self) -> usize {
+        let mut n = 0;
+        for p in self.jobs.iter().filter(|j| !j.cancelled()).filter_map(|j| j.progress.as_ref()) {
+            p.cancel();
+            n += 1;
+        }
+        n
+    }
+
+    /// Hide the exports in progress from the progress dialog (they go on) → how many there were.
+    pub fn hide_exports(&mut self) -> usize {
+        let mut n = 0;
+        for j in self.jobs.iter_mut().filter(|j| j.progress.is_some() && !j.hidden && !j.cancelled()) {
+            j.hidden = true;
+            n += 1;
+        }
+        n
+    }
 }
 
 /// Run `work` on a worker thread when `enabled` and the host can write from one, else now; `then`
@@ -106,6 +143,20 @@ pub fn run(
     doc: Option<u64>,
     work: impl FnOnce(Writer) -> Result<Value, String> + Send + 'static,
     then: impl FnOnce(&mut VectorcraftApp, Result<Value, String>) -> Result<Value, String> + 'static,
+) -> Result<Value, String> {
+    run_with_progress(app, enabled, label, doc, None, work, then)
+}
+
+/// [`run`] for work that reports to `progress` (an export): the progress dialog shows it while it
+/// runs in the background, with Cancel.
+pub fn run_with_progress(
+    app: &mut VectorcraftApp,
+    enabled: bool,
+    label: String,
+    doc: Option<u64>,
+    progress: Option<Arc<Progress>>,
+    work: impl FnOnce(Writer) -> Result<Value, String> + Send + 'static,
+    then: impl FnOnce(&mut VectorcraftApp, Result<Value, String>) -> Result<Value, String> + 'static,
 ) -> Result<Value, String> {
     let mut work: Work = Box::new(work);
     let shared = app.services.write_shared.clone().filter(|_| enabled && app.services.download.is_none());
@@ -116,7 +167,7 @@ pub fn run(
                 Ok(()) => {
                     let bg = &mut app.background;
                     bg.next_id += 1;
-                    bg.jobs.push(Job { id, label: label.clone(), doc, then: Box::new(then) });
+                    bg.jobs.push(Job { id, label: label.clone(), doc, progress, hidden: false, then: Box::new(then) });
                     if label.is_empty() {
                         return Ok(json!({ "background": true }));
                     }

crates/ui-egui/src/chrome.rs

@@ -739,7 +739,7 @@ pub fn status_bar(app: &mut VectorcraftApp, ui: &mut Ui) {
                         .background
                         .jobs
                         .iter()
-                        .filter(|j| !j.label.is_empty())
+                        .filter(|j| !j.label.is_empty() && !j.cancelled())
                         .map(|j| j.label.as_str())
                         .chain(app.opening.pending.iter().map(|p| p.label.as_str()))
                         .collect();

crates/ui-egui/src/export_progress.rs

@@ -0,0 +1,196 @@
+//! The export progress dialog: while an export runs in the background (Background Export) a modal
+//! window shows what is being exported, how far it has got (artboard by artboard for raster
+//! exports of several artboards; busy for one artboard and for formats made in one go, which
+//! report no steps) and two buttons: Cancel (`file.cancelExport`, also
+//! Esc) stops it and writes nothing, Continue in Background (`file.exportInBackground`) closes the
+//! dialog and leaves the export to the status bar.
+//!
+//! It opens after [`DELAY`] so a quick export doesn't flash it, and waits while another dialog is
+//! open (the overwrite question, an options dialog): never two modals at once.
+
+use serde_json::json;
+
+use crate::dialogs::modal;
+use crate::theme::Tokens;
+use crate::{VectorcraftApp, widgets};
+
+/// Seconds an export runs before the dialog opens.
+pub const DELAY: f64 = 0.4;
+
+/// Where the job a frame first saw is remembered (its id, the time it was first seen).
+fn seen_id() -> egui::Id {
+    egui::Id::new("export-progress-seen")
+}
+
+/// What the dialog shows: (label, steps done, steps in all, share done, exports after this one).
+fn shown(app: &VectorcraftApp, now: f64, ctx: &egui::Context) -> Option<(String, u64, u64, f32, usize)> {
+    let jobs: Vec<_> = app.background.jobs.iter().filter(|j| !j.hidden && !j.cancelled()).filter(|j| j.progress.is_some()).collect();
+    let first = jobs.first()?;
+    let since = ctx.data_mut(|m| {
+        let seen = m.get_temp_mut_or_insert_with(seen_id(), || (first.id(), now));
+        if seen.0 != first.id() {
+            *seen = (first.id(), now);
+        }
+        seen.1
+    });
+    if now - since < DELAY {
+        return None;
+    }
+    let (done, total) = first.progress.as_ref().map(|p| p.counts()).unwrap_or_default();
+    let frac = first.progress.as_ref().and_then(|p| p.fraction()).unwrap_or(0.0) as f32;
+    Some((first.label.clone(), done, total, frac, jobs.len() - 1))
+}
+
+pub fn show(app: &mut VectorcraftApp, ctx: &egui::Context) {
+    let now = ctx.input(|i| i.time);
+    let Some((label, done, total, frac, more)) = shown(app, now, ctx) else { return };
+    if app.ui.dialog.is_some() {
+        return;
+    }
+    let t = Tokens::get(ctx);
+    let heading = format!("{}…", crate::i18n::msg(&label));
+    let mut action = None;
+    modal::show(ctx, &heading, egui::Id::new("export-progress"), -40.0, 20, |ui| {
+        ui.set_width(360.0);
+        modal::heading(ui, &heading);
+        ui.add_space(12.0);
+        // One step says nothing a spinner doesn't: the bar would sit at 0 % until the file is written.
+        if total > 1 {
+            let step = crate::i18n::fmt(tl!("Artboard {n} of {total}"), &[("n", &(done + 1).min(total).to_string()), ("total", &total.to_string())]);
+            // The count on its own line: drawn over the bar it would straddle the fill's edge.
+            ui.horizontal(|ui| {
+                ui.label(egui::RichText::new(step).color(t.text_dim));
+                ui.with_layout(egui::Layout::right_to_left(egui::Align::Center), |ui| {
+                    ui.label(egui::RichText::new(format!("{:.0} %", frac * 100.0)).color(t.text_dim));
+                });
+            });
+            ui.add_space(4.0);
+            ui.add(egui::ProgressBar::new(frac).desired_width(360.0).desired_height(6.0).fill(t.accent));
+        } else {
+            ui.horizontal(|ui| {
+                ui.add(egui::Spinner::new().size(14.0).color(t.accent));
+                ui.label(egui::RichText::new(tl!("Encoding and writing the file…")).color(t.text_dim));
+            });
+        }
+        if more > 0 {
+            ui.add_space(6.0);
+            let queued = crate::i18n::tn(more as u64, "{n} more export waiting", "{n} more exports waiting");
+            ui.label(egui::RichText::new(queued).size(11.5).color(t.text_dim));
+        }
+        ui.add_space(16.0);
+        let row = egui::vec2(ui.min_rect().width(), ui.spacing().interact_size.y);
+        ui.allocate_ui_with_layout(row, egui::Layout::right_to_left(egui::Align::Center), |ui| {
+            if widgets::secondary_button(ui, "Cancel").clicked() {
+                action = Some("file.cancelExport");
+            }
+            ui.add_space(8.0);
+            if widgets::secondary_button(ui, "Continue in Background").clicked() {
+                action = Some("file.exportInBackground");
+            }
+        });
+    });
+    if ctx.input(|i| i.key_pressed(egui::Key::Escape)) {
+        action = Some("file.cancelExport");
+    }
+    if let Some(id) = action
+        && let Err(e) = app.run(id, json!({}))
+    {
+        app.status(e);
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use std::sync::Arc;
+
+    use serde_json::json;
+    use vectorcraft_engine::Session;
+    use vectorcraft_engine::cmd::fileio::progress::Progress;
+
+    use crate::{Services, VectorcraftApp, background};
+
+    /// An app whose background writer waits until `go` is set.
+    fn app(go: Arc<std::sync::atomic::AtomicBool>) -> VectorcraftApp {
+        let services = Services {
+            write_shared: Some(Arc::new(move |_: &str, _: &[u8]| {
+                while !go.load(std::sync::atomic::Ordering::SeqCst) {
+                    std::thread::sleep(std::time::Duration::from_millis(1));
+                }
+                Ok(())
+            })),
+            ..Default::default()
+        };
+        VectorcraftApp::new(Session::new(), services)
+    }
+
+    /// Draws one frame of the dialog at `time` seconds → the texts it drew.
+    fn frame(app: &mut VectorcraftApp, ctx: &egui::Context, time: f64) -> String {
+        let mut out = ctx.run_ui(egui::RawInput { time: Some(time), ..Default::default() }, |ui| super::show(app, ui.ctx()));
+        out.textures_delta.clear();
+        let mut texts = String::new();
+        for shape in out.shapes {
+            if let egui::epaint::Shape::Text(t) = shape.shape {
+                texts.push_str(t.galley.text());
+                texts.push('\n');
+            }
+        }
+        texts
+    }
+
+    #[test]
+    fn opens_after_the_delay_and_cancel_closes_it() {
+        let go = Arc::new(std::sync::atomic::AtomicBool::new(false));
+        let mut app = app(go.clone());
+        let p = Progress::new();
+        let r = background::run_with_progress(
+            &mut app,
+            true,
+            "Exporting a.png".into(),
+            None,
+            Some(p.clone()),
+            |w| w("/a.png", b"x").map(|()| json!({})),
+            |_, r| r,
+        );
+        assert_eq!(r.unwrap()["background"], true);
+        let ctx = egui::Context::default();
+        crate::theme::install_fonts(&ctx);
+        assert!(!frame(&mut app, &ctx, 0.0).contains("Exporting a.png"), "not before the delay");
+        frame(&mut app, &ctx, 1.0); // a new window measures itself unseen first
+        let shown = frame(&mut app, &ctx, 1.1);
+        assert!(shown.contains("Exporting a.png") && shown.contains("Cancel") && shown.contains("Continue in Background"), "{shown}");
+        app.run("file.cancelExport", json!({})).unwrap();
+        assert!(p.cancelled());
+        assert_eq!(app.ui.status, crate::io::EXPORT_CANCELLED);
+        assert!(!frame(&mut app, &ctx, 2.0).contains("Exporting a.png"), "a cancelled export isn't shown");
+        go.store(true, std::sync::atomic::Ordering::SeqCst);
+        background::wait_all(&mut app);
+    }
+
+    #[test]
+    fn continue_in_background_hides_it_and_the_export_goes_on() {
+        let go = Arc::new(std::sync::atomic::AtomicBool::new(false));
+        let mut app = app(go.clone());
+        let p = Progress::new();
+        background::run_with_progress(
+            &mut app,
+            true,
+            "Exporting b.png".into(),
+            None,
+            Some(p.clone()),
+            |w| w("/b.png", b"x").map(|()| json!({})),
+            |_, r| r,
+        )
+        .unwrap();
+        let ctx = egui::Context::default();
+        crate::theme::install_fonts(&ctx);
+        frame(&mut app, &ctx, 0.0);
+        frame(&mut app, &ctx, 1.0);
+        assert!(frame(&mut app, &ctx, 1.1).contains("Exporting b.png"));
+        assert_eq!(app.run("file.exportInBackground", json!({})).unwrap()["hidden"], 1);
+        assert!(!frame(&mut app, &ctx, 2.0).contains("Exporting b.png"));
+        assert!(!p.cancelled());
+        go.store(true, std::sync::atomic::Ordering::SeqCst);
+        background::wait_all(&mut app);
+        assert!(app.background.jobs.is_empty());
+    }
+}

crates/ui-egui/src/i18n/bg.tsv

@@ -5153,6 +5153,12 @@ theme	Appearance	Външен вид
 	Enable Guides for 9-Slice Scaling	Включване на водачи за 9-slice мащабиране
 	Persistent	Постоянна
 	Library Panel Options	Опции на панела с библиотека
+	Artboard {n} of {total}	Работна област {n} от {total}
+	Encoding and writing the file…	Кодиране и записване на файла…
+@plural	{n} more export waiting|{n} more exports waiting	Още {n} експортиране в изчакване|Още {n} експортирания в изчакване
+	Continue in Background	Продължаване във фонов режим
+	Cancel Export	Отказ от експортирането
+@msg	Export cancelled	Експортирането е отказано
 # Paragraph panel menu › Justification…
 	Desired	Желано
 	Word Spacing:	Разстояние между думите:

crates/ui-egui/src/i18n/cs.tsv

@@ -5188,6 +5188,12 @@ mark-style	Japanese	Japonské
 @msg	too many library panels were opened in this session	v této relaci bylo otevřeno příliš mnoho panelů knihoven
 @msg	The image is {_1} × {_2} pixels, more than {LARGE_TRACE_SIDE} on a side: it is traced, but more slowly. A lower-fidelity preset or a smaller copy of the image traces faster.	Obraz má {_1} × {_2} pixelů, na jedné straně více než {LARGE_TRACE_SIDE}: vektorizuje se, ale pomaleji. Rychleji se vektorizuje s předvolbou nižší věrnosti nebo menší kopie obrazu.
 @msg	The image was traced at {_1} × {_2} pixels, scaled down from {_3} × {_4} ({_5} megapixels at most).	Obraz byl vektorizován v rozlišení {_1} × {_2} pixelů, zmenšený z {_3} × {_4} (nejvýše {_5} megapixelů).
+	Artboard {n} of {total}	Pracovní plocha {n} z {total}
+	Encoding and writing the file…	Kódování a zápis souboru…
+@plural	{n} more export waiting|{n} more exports waiting	Čeká ještě {n} export|Čekají ještě {n} exporty|Čeká ještě {n} exportů
+	Continue in Background	Pokračovat na pozadí
+	Cancel Export	Zrušit export
+@msg	Export cancelled	Export byl zrušen
 # Paragraph panel menu › Justification…
 	Desired	Požadované
 	Word Spacing:	Mezery mezi slovy:

crates/ui-egui/src/i18n/da.tsv

@@ -5172,6 +5172,12 @@ swatch	Bright Violet	Kraftig violet
 	Typing	Indtastning
 	Persistent	Vedvarende
 	Library Panel Options	Indstillinger for bibliotekspanel
+	Artboard {n} of {total}	Tegneflade {n} af {total}
+	Encoding and writing the file…	Koder og skriver filen…
+@plural	{n} more export waiting|{n} more exports waiting	{n} eksport mere venter|{n} eksporter mere venter
+	Continue in Background	Fortsæt i baggrunden
+	Cancel Export	Annullér eksport
+@msg	Export cancelled	Eksport annulleret
 # Paragraph panel menu › Justification…
 	Desired	Ønsket
 	Word Spacing:	Ordafstand:

crates/ui-egui/src/i18n/de.tsv

@@ -4763,6 +4763,12 @@ effect	Regular	Regelmäßig
 @msg	too many library panels were opened in this session	in dieser Sitzung wurden zu viele Bibliotheksbedienfelder geöffnet
 @msg	The image is {_1} × {_2} pixels, more than {LARGE_TRACE_SIDE} on a side: it is traced, but more slowly. A lower-fidelity preset or a smaller copy of the image traces faster.	Das Bild hat {_1} × {_2} Pixel, mehr als {LARGE_TRACE_SIDE} auf einer Seite: Es wird nachgezeichnet, aber langsamer. Eine Vorgabe mit geringerer Detailtreue oder eine kleinere Kopie des Bildes geht schneller.
 @msg	The image was traced at {_1} × {_2} pixels, scaled down from {_3} × {_4} ({_5} megapixels at most).	Das Bild wurde mit {_1} × {_2} Pixeln nachgezeichnet, verkleinert von {_3} × {_4} (höchstens {_5} Megapixel).
+	Artboard {n} of {total}	Zeichenfläche {n} von {total}
+	Encoding and writing the file…	Datei wird codiert und geschrieben…
+@plural	{n} more export waiting|{n} more exports waiting	{n} weiterer Export wartet|{n} weitere Exporte warten
+	Continue in Background	Im Hintergrund fortsetzen
+	Cancel Export	Export abbrechen
+@msg	Export cancelled	Export abgebrochen
 # Paragraph panel menu › Justification…
 	Desired	Optimal
 	Word Spacing:	Wortabstand:

crates/ui-egui/src/i18n/el.tsv

@@ -5140,6 +5140,12 @@ effect	Points	Σημεία
 @msg	too many library panels were opened in this session	άνοιξαν πάρα πολλοί πίνακες βιβλιοθηκών σε αυτή τη συνεδρία
 @msg	The image is {_1} × {_2} pixels, more than {LARGE_TRACE_SIDE} on a side: it is traced, but more slowly. A lower-fidelity preset or a smaller copy of the image traces faster.	Η εικόνα είναι {_1} × {_2} εικονοστοιχεία, πάνω από {LARGE_TRACE_SIDE} σε μία πλευρά: ανιχνεύεται, αλλά πιο αργά. Μια προρύθμιση χαμηλότερης πιστότητας ή ένα μικρότερο αντίγραφο της εικόνας ανιχνεύεται γρηγορότερα.
 @msg	The image was traced at {_1} × {_2} pixels, scaled down from {_3} × {_4} ({_5} megapixels at most).	Η εικόνα ανιχνεύτηκε σε {_1} × {_2} εικονοστοιχεία, σμικρυμένη από {_3} × {_4} (το πολύ {_5} megapixel).
+	Artboard {n} of {total}	Πίνακας σχεδίασης {n} από {total}
+	Encoding and writing the file…	Κωδικοποίηση και εγγραφή του αρχείου…
+@plural	{n} more export waiting|{n} more exports waiting	{n} ακόμη εξαγωγή σε αναμονή|{n} ακόμη εξαγωγές σε αναμονή
+	Continue in Background	Συνέχεια στο παρασκήνιο
+	Cancel Export	Ακύρωση εξαγωγής
+@msg	Export cancelled	Η εξαγωγή ακυρώθηκε
 # Paragraph panel menu › Justification…
 	Desired	Επιθυμητό
 	Word Spacing:	Απόσταση λέξεων:

crates/ui-egui/src/i18n/es.tsv

@@ -5130,6 +5130,12 @@ mark-style	Japanese	Japonesas
 @msg	too many library panels were opened in this session	se abrieron demasiados paneles de biblioteca en esta sesión
 @msg	The image is {_1} × {_2} pixels, more than {LARGE_TRACE_SIDE} on a side: it is traced, but more slowly. A lower-fidelity preset or a smaller copy of the image traces faster.	La imagen tiene {_1} × {_2} píxeles, más de {LARGE_TRACE_SIDE} en un lado: se calcará, pero más despacio. Un ajuste preestablecido de menor fidelidad o una copia más pequeña de la imagen se calcan más rápido.
 @msg	The image was traced at {_1} × {_2} pixels, scaled down from {_3} × {_4} ({_5} megapixels at most).	La imagen se calcó a {_1} × {_2} píxeles, reducida desde {_3} × {_4} ({_5} megapíxeles como máximo).
+	Artboard {n} of {total}	Mesa de trabajo {n} de {total}
+	Encoding and writing the file…	Codificando y escribiendo el archivo…
+@plural	{n} more export waiting|{n} more exports waiting	{n} exportación más en espera|{n} exportaciones más en espera
+	Continue in Background	Continuar en segundo plano
+	Cancel Export	Cancelar exportación
+@msg	Export cancelled	Exportación cancelada
 # Paragraph panel menu › Justification…
 	Desired	Deseado
 	Word Spacing:	Espaciado entre palabras:

crates/ui-egui/src/i18n/fi.tsv

@@ -5152,6 +5152,12 @@ mark-style	Japanese	Japanilainen
 @msg	too many library panels were opened in this session	tässä istunnossa on avattu liian monta kirjastopaneelia
 @msg	The image is {_1} × {_2} pixels, more than {LARGE_TRACE_SIDE} on a side: it is traced, but more slowly. A lower-fidelity preset or a smaller copy of the image traces faster.	Kuva on {_1} × {_2} kuvapistettä, yhdeltä sivultaan yli {LARGE_TRACE_SIDE}: se jäljitetään, mutta hitaammin. Pienemmän tarkkuuden esiasetus tai kuvan pienempi kopio jäljittyy nopeammin.
 @msg	The image was traced at {_1} × {_2} pixels, scaled down from {_3} × {_4} ({_5} megapixels at most).	Kuva jäljitettiin kokoon {_1} × {_2} kuvapistettä pienennettynä koosta {_3} × {_4} (enintään {_5} megapikseliä).
+	Artboard {n} of {total}	Piirtoalusta {n}/{total}
+	Encoding and writing the file…	Tiedostoa koodataan ja kirjoitetaan…
+@plural	{n} more export waiting|{n} more exports waiting	{n} vienti odottaa|{n} vientiä odottaa
+	Continue in Background	Jatka taustalla
+	Cancel Export	Peruuta vienti
+@msg	Export cancelled	Vienti peruutettiin
 # Paragraph panel menu › Justification…
 	Desired	Haluttu
 	Word Spacing:	Sanaväli:

crates/ui-egui/src/i18n/fr.tsv

@@ -5187,6 +5187,12 @@ theme	Appearance	Apparence
 @msg	too many library panels were opened in this session	trop de panneaux de bibliothèque ont été ouverts dans cette session
 @msg	The image is {_1} × {_2} pixels, more than {LARGE_TRACE_SIDE} on a side: it is traced, but more slowly. A lower-fidelity preset or a smaller copy of the image traces faster.	L’image fait {_1} × {_2} pixels, plus de {LARGE_TRACE_SIDE} sur un côté : elle est vectorisée, mais plus lentement. Un paramètre prédéfini moins fidèle ou une copie plus petite de l’image se vectorise plus vite.
 @msg	The image was traced at {_1} × {_2} pixels, scaled down from {_3} × {_4} ({_5} megapixels at most).	L’image a été vectorisée à {_1} × {_2} pixels, réduite de {_3} × {_4} ({_5} mégapixels au plus).
+	Artboard {n} of {total}	Plan de travail {n} sur {total}
+	Encoding and writing the file…	Encodage et écriture du fichier…
+@plural	{n} more export waiting|{n} more exports waiting	{n} autre exportation en attente|{n} autres exportations en attente
+	Continue in Background	Continuer en arrière-plan
+	Cancel Export	Annuler l’exportation
+@msg	Export cancelled	Exportation annulée
 # Paragraph panel menu › Justification…
 	Desired	Optimal
 	Word Spacing:	Espacement des mots :

crates/ui-egui/src/i18n/hu.tsv

@@ -5174,6 +5174,12 @@ imageTrace	Outline	Körvonal
 @msg	too many library panels were opened in this session	ebben a munkamenetben túl sok könyvtárpanel nyílt meg
 @msg	The image is {_1} × {_2} pixels, more than {LARGE_TRACE_SIDE} on a side: it is traced, but more slowly. A lower-fidelity preset or a smaller copy of the image traces faster.	A kép {_1} × {_2} képpont, egyik oldalán több mint {LARGE_TRACE_SIDE}: a vektorizálás megtörténik, de lassabban. Kisebb hűségű előbeállítással vagy a kép kisebb másolatával gyorsabb.
 @msg	The image was traced at {_1} × {_2} pixels, scaled down from {_3} × {_4} ({_5} megapixels at most).	A kép vektorizálása {_1} × {_2} képponton történt, {_3} × {_4} méretről kicsinyítve (legfeljebb {_5} megapixel).
+	Artboard {n} of {total}	Rajztábla: {n} / {total}
+	Encoding and writing the file…	A fájl kódolása és írása…
+@plural	{n} more export waiting|{n} more exports waiting	Még {n} exportálás várakozik
+	Continue in Background	Folytatás a háttérben
+	Cancel Export	Exportálás megszakítása
+@msg	Export cancelled	Az exportálás megszakítva
 # Paragraph panel menu › Justification…
 	Desired	Kívánt
 	Word Spacing:	Szóköz:

crates/ui-egui/src/i18n/id.tsv

@@ -5172,6 +5172,12 @@ swatch	Bright Violet	Violet cerah
 	Typing	Mengetik
 	Persistent	Persisten
 	Library Panel Options	Opsi panel pustaka
+	Artboard {n} of {total}	Artboard {n} dari {total}
+	Encoding and writing the file…	Mengodekan dan menulis berkas…
+@plural	{n} more export waiting|{n} more exports waiting	{n} ekspor lagi menunggu
+	Continue in Background	Lanjutkan di latar belakang
+	Cancel Export	Batalkan ekspor
+@msg	Export cancelled	Ekspor dibatalkan
 # Paragraph panel menu › Justification…
 	Desired	Diinginkan
 	Word Spacing:	Spasi Kata:

crates/ui-egui/src/i18n/it.tsv

@@ -4801,6 +4801,12 @@ lighting	Light	Luce
 @msg	too many library panels were opened in this session	in questa sessione sono stati aperti troppi pannelli libreria
 @msg	The image is {_1} × {_2} pixels, more than {LARGE_TRACE_SIDE} on a side: it is traced, but more slowly. A lower-fidelity preset or a smaller copy of the image traces faster.	L’immagine è di {_1} × {_2} pixel, più di {LARGE_TRACE_SIDE} su un lato: viene vettorializzata, ma più lentamente. Un predefinito a fedeltà più bassa o una copia più piccola dell’immagine è più veloce.
 @msg	The image was traced at {_1} × {_2} pixels, scaled down from {_3} × {_4} ({_5} megapixels at most).	L’immagine è stata vettorializzata a {_1} × {_2} pixel, ridotta da {_3} × {_4} (al massimo {_5} megapixel).
+	Artboard {n} of {total}	Tavola da disegno {n} di {total}
+	Encoding and writing the file…	Codifica e scrittura del file…
+@plural	{n} more export waiting|{n} more exports waiting	{n} altra esportazione in attesa|{n} altre esportazioni in attesa
+	Continue in Background	Continua in background
+	Cancel Export	Annulla esportazione
+@msg	Export cancelled	Esportazione annullata
 # Paragraph panel menu › Justification…
 	Desired	Desiderato
 	Word Spacing:	Spaziatura parole:

crates/ui-egui/src/i18n/ja.tsv

@@ -4841,6 +4841,12 @@ lighting	Light	ライト
 @msg	too many library panels were opened in this session	このセッションで開いたライブラリパネルが多すぎます
 @msg	The image is {_1} × {_2} pixels, more than {LARGE_TRACE_SIDE} on a side: it is traced, but more slowly. A lower-fidelity preset or a smaller copy of the image traces faster.	画像は {_1} × {_2} ピクセルで、一辺が {LARGE_TRACE_SIDE} を超えています。トレースはできますが、時間がかかります。忠実度の低いプリセットや画像の小さいコピーを使うと速くなります。
 @msg	The image was traced at {_1} × {_2} pixels, scaled down from {_3} × {_4} ({_5} megapixels at most).	画像は {_3} × {_4} から縮小した {_1} × {_2} ピクセルでトレースされました (最大 {_5} メガピクセル)。
+	Artboard {n} of {total}	アートボード {n} / {total}
+	Encoding and writing the file…	ファイルをエンコードして書き込み中…
+@plural	{n} more export waiting|{n} more exports waiting	待機中の書き出し: あと {n} 件
+	Continue in Background	バックグラウンドで続行
+	Cancel Export	書き出しをキャンセル
+@msg	Export cancelled	書き出しをキャンセルしました
 # Paragraph panel menu › Justification…
 	Desired	最適
 	Word Spacing:	単語間隔:

crates/ui-egui/src/i18n/ko.tsv

@@ -4764,6 +4764,12 @@ lighting	Light	광원
 @msg	too many library panels were opened in this session	이 세션에서 라이브러리 패널을 너무 많이 열었습니다
 @msg	The image is {_1} × {_2} pixels, more than {LARGE_TRACE_SIDE} on a side: it is traced, but more slowly. A lower-fidelity preset or a smaller copy of the image traces faster.	이미지가 {_1} × {_2}픽셀로 한 변이 {LARGE_TRACE_SIDE}을 넘습니다. 추적은 되지만 더 느립니다. 충실도가 낮은 사전 설정이나 이미지의 작은 사본을 사용하면 더 빠릅니다.
 @msg	The image was traced at {_1} × {_2} pixels, scaled down from {_3} × {_4} ({_5} megapixels at most).	이미지를 {_3} × {_4}에서 축소한 {_1} × {_2}픽셀로 추적했습니다(최대 {_5}메가픽셀).
+	Artboard {n} of {total}	아트보드 {n} / {total}
+	Encoding and writing the file…	파일을 인코딩하고 쓰는 중…
+@plural	{n} more export waiting|{n} more exports waiting	대기 중인 내보내기 {n}개 더
+	Continue in Background	백그라운드에서 계속
+	Cancel Export	내보내기 취소
+@msg	Export cancelled	내보내기를 취소했습니다
 # Paragraph panel menu › Justification…
 	Desired	희망
 	Word Spacing:	단어 간격:

crates/ui-egui/src/i18n/nl.tsv

@@ -5215,7 +5215,12 @@ swatch	Bright Violet	Felviolet
 @msg	too many library panels were opened in this session	er zijn in deze sessie te veel bibliotheekpanelen geopend
 @msg	The image is {_1} × {_2} pixels, more than {LARGE_TRACE_SIDE} on a side: it is traced, but more slowly. A lower-fidelity preset or a smaller copy of the image traces faster.	De afbeelding is {_1} × {_2} pixels, meer dan {LARGE_TRACE_SIDE} aan één zijde: ze wordt getraceerd, maar langzamer. Een voorinstelling met minder detail of een kleinere kopie van de afbeelding traceert sneller.
 @msg	The image was traced at {_1} × {_2} pixels, scaled down from {_3} × {_4} ({_5} megapixels at most).	De afbeelding is getraceerd op {_1} × {_2} pixels, verkleind van {_3} × {_4} (maximaal {_5} megapixels).
-
+	Artboard {n} of {total}	Tekengebied {n} van {total}
+	Encoding and writing the file…	Bestand coderen en schrijven…
+@plural	{n} more export waiting|{n} more exports waiting	Nog {n} export in de wachtrij|Nog {n} exports in de wachtrij
+	Continue in Background	Doorgaan op achtergrond
+	Cancel Export	Export annuleren
+@msg	Export cancelled	Export geannuleerd
 # Paragraph panel menu › Justification…
 	Desired	Gewenst
 	Word Spacing:	Woordafstand:

crates/ui-egui/src/i18n/pl.tsv

@@ -5040,6 +5040,12 @@ mark-style	Japanese	Japońskie
 @msg	too many library panels were opened in this session	w tej sesji otwarto zbyt wiele paneli bibliotek
 @msg	The image is {_1} × {_2} pixels, more than {LARGE_TRACE_SIDE} on a side: it is traced, but more slowly. A lower-fidelity preset or a smaller copy of the image traces faster.	Obraz ma {_1} × {_2} pikseli, ponad {LARGE_TRACE_SIDE} na jednym boku: zostanie obrysowany, ale wolniej. Ustawienie wstępne o niższej wierności lub mniejsza kopia obrazu obrysuje się szybciej.
 @msg	The image was traced at {_1} × {_2} pixels, scaled down from {_3} × {_4} ({_5} megapixels at most).	Obraz obrysowano w rozdzielczości {_1} × {_2} pikseli, po zmniejszeniu z {_3} × {_4} (najwyżej {_5} megapikseli).
+	Artboard {n} of {total}	Obszar kompozycji {n} z {total}
+	Encoding and writing the file…	Kodowanie i zapisywanie pliku…
+@plural	{n} more export waiting|{n} more exports waiting	Czeka jeszcze {n} eksport|Czekają jeszcze {n} eksporty|Czeka jeszcze {n} eksportów
+	Continue in Background	Kontynuuj w tle
+	Cancel Export	Anuluj eksport
+@msg	Export cancelled	Eksport anulowany
 # Paragraph panel menu › Justification…
 	Desired	Optymalne
 	Word Spacing:	Odstępy między wyrazami:

crates/ui-egui/src/i18n/pt-br.tsv

@@ -5105,6 +5105,12 @@ mark-style	Japanese	Japonesas
 @msg	too many library panels were opened in this session	foram abertos painéis de biblioteca demais nesta sessão
 @msg	The image is {_1} × {_2} pixels, more than {LARGE_TRACE_SIDE} on a side: it is traced, but more slowly. A lower-fidelity preset or a smaller copy of the image traces faster.	A imagem tem {_1} × {_2} pixels, mais de {LARGE_TRACE_SIDE} em um lado: ela é traçada, mas mais devagar. Uma predefinição de menor fidelidade ou uma cópia menor da imagem traça mais rápido.
 @msg	The image was traced at {_1} × {_2} pixels, scaled down from {_3} × {_4} ({_5} megapixels at most).	A imagem foi traçada em {_1} × {_2} pixels, reduzida de {_3} × {_4} (no máximo {_5} megapixels).
+	Artboard {n} of {total}	Mesa de Trabalho {n} de {total}
+	Encoding and writing the file…	Codificando e gravando o arquivo…
+@plural	{n} more export waiting|{n} more exports waiting	Mais {n} exportação aguardando|Mais {n} exportações aguardando
+	Continue in Background	Continuar em Segundo Plano
+	Cancel Export	Cancelar Exportação
+@msg	Export cancelled	Exportação cancelada
 # Paragraph panel menu › Justification…
 	Desired	Desejado
 	Word Spacing:	Espaçamento entre Palavras:

crates/ui-egui/src/i18n/ru.tsv

@@ -4797,6 +4797,12 @@ lighting	Light	Свет
 @msg	too many library panels were opened in this session	в этом сеансе открыто слишком много панелей библиотек
 @msg	The image is {_1} × {_2} pixels, more than {LARGE_TRACE_SIDE} on a side: it is traced, but more slowly. A lower-fidelity preset or a smaller copy of the image traces faster.	Изображение {_1} × {_2} пикселей, больше {LARGE_TRACE_SIDE} по одной стороне: трассировка выполняется, но медленнее. Стиль с меньшей точностью или уменьшенная копия изображения трассируются быстрее.
 @msg	The image was traced at {_1} × {_2} pixels, scaled down from {_3} × {_4} ({_5} megapixels at most).	Изображение трассировано в размере {_1} × {_2} пикселей, уменьшенное с {_3} × {_4} (не более {_5} мегапикселей).
+	Artboard {n} of {total}	Монтажная область {n} из {total}
+	Encoding and writing the file…	Кодирование и запись файла…
+@plural	{n} more export waiting|{n} more exports waiting	Ещё {n} экспорт в очереди|Ещё {n} экспорта в очереди|Ещё {n} экспортов в очереди
+	Continue in Background	Продолжить в фоне
+	Cancel Export	Отменить экспорт
+@msg	Export cancelled	Экспорт отменён
 # Paragraph panel menu › Justification…
 	Desired	Желательно
 	Word Spacing:	Интервал между словами:

crates/ui-egui/src/i18n/sv.tsv

@@ -5144,6 +5144,12 @@ theme	Appearance	Utseende
 @msg	too many library panels were opened in this session	för många bibliotekspaneler har öppnats i den här sessionen
 @msg	The image is {_1} × {_2} pixels, more than {LARGE_TRACE_SIDE} on a side: it is traced, but more slowly. A lower-fidelity preset or a smaller copy of the image traces faster.	Bilden är {_1} × {_2} pixlar, mer än {LARGE_TRACE_SIDE} på en sida: den vektoriseras, men långsammare. En förinställning med lägre återgivning eller en mindre kopia av bilden går snabbare.
 @msg	The image was traced at {_1} × {_2} pixels, scaled down from {_3} × {_4} ({_5} megapixels at most).	Bilden vektoriserades vid {_1} × {_2} pixlar, nedskalad från {_3} × {_4} (högst {_5} megapixlar).
+	Artboard {n} of {total}	Rityta {n} av {total}
+	Encoding and writing the file…	Kodar och skriver filen…
+@plural	{n} more export waiting|{n} more exports waiting	{n} export till väntar|{n} exporter till väntar
+	Continue in Background	Fortsätt i bakgrunden
+	Cancel Export	Avbryt export
+@msg	Export cancelled	Exporten avbröts
 # Paragraph panel menu › Justification…
 	Desired	Önskat
 	Word Spacing:	Ordavstånd:

crates/ui-egui/src/i18n/uk.tsv

@@ -4781,6 +4781,12 @@ lighting	Light	Світло
 @msg	too many library panels were opened in this session	у цьому сеансі відкрито забагато панелей бібліотек
 @msg	The image is {_1} × {_2} pixels, more than {LARGE_TRACE_SIDE} on a side: it is traced, but more slowly. A lower-fidelity preset or a smaller copy of the image traces faster.	Зображення {_1} × {_2} пікселів, понад {LARGE_TRACE_SIDE} з одного боку: трасування виконується, але повільніше. Стиль із нижчою точністю або менша копія зображення трасуються швидше.
 @msg	The image was traced at {_1} × {_2} pixels, scaled down from {_3} × {_4} ({_5} megapixels at most).	Зображення трасовано в розмірі {_1} × {_2} пікселів, зменшене з {_3} × {_4} (щонайбільше {_5} мегапікселів).
+	Artboard {n} of {total}	Монтажна область {n} з {total}
+	Encoding and writing the file…	Кодування та запис файлу…
+@plural	{n} more export waiting|{n} more exports waiting	Ще {n} експорт в очікуванні|Ще {n} експорти в очікуванні|Ще {n} експортів в очікуванні
+	Continue in Background	Продовжити у фоні
+	Cancel Export	Скасувати експорт
+@msg	Export cancelled	Експорт скасовано
 # Paragraph panel menu › Justification…
 	Desired	Бажане
 	Word Spacing:	Інтервал між словами:

crates/ui-egui/src/i18n/vi.tsv

@@ -4781,6 +4781,12 @@ theme	Appearance	Giao diện
 @msg	too many library panels were opened in this session	đã mở quá nhiều bảng thư viện trong phiên này
 @msg	The image is {_1} × {_2} pixels, more than {LARGE_TRACE_SIDE} on a side: it is traced, but more slowly. A lower-fidelity preset or a smaller copy of the image traces faster.	Ảnh có kích thước {_1} × {_2} điểm ảnh, hơn {LARGE_TRACE_SIDE} ở một cạnh: ảnh vẫn được dò, nhưng chậm hơn. Một thiết lập sẵn có độ trung thực thấp hơn hoặc một bản sao nhỏ hơn của ảnh sẽ dò nhanh hơn.
 @msg	The image was traced at {_1} × {_2} pixels, scaled down from {_3} × {_4} ({_5} megapixels at most).	Ảnh đã được dò ở {_1} × {_2} điểm ảnh, thu nhỏ từ {_3} × {_4} (tối đa {_5} megapixel).
+	Artboard {n} of {total}	Bảng vẽ {n} / {total}
+	Encoding and writing the file…	Đang mã hóa và ghi tệp…
+@plural	{n} more export waiting|{n} more exports waiting	Còn {n} lượt xuất đang chờ
+	Continue in Background	Tiếp tục trong nền
+	Cancel Export	Hủy xuất
+@msg	Export cancelled	Đã hủy xuất
 # Paragraph panel menu › Justification…
 	Desired	Mong muốn
 	Word Spacing:	Khoảng cách từ:

crates/ui-egui/src/i18n/zh-hans.tsv

@@ -5023,7 +5023,12 @@ lighting	Light	光源
 @msg	only http, https and mailto URLs open in the browser, not “{url}”	浏览器中只会打开 http、https 和 mailto 的 URL，不会打开 “{url}”
 @msg	{id} opens another app: only the person at the keyboard can run it	{id} 会打开其他应用程序：只有使用键盘的人才能运行它
 @msg	“{name}” is not a file	“{name}” 不是文件
-
+	Artboard {n} of {total}	画板 {n} / {total}
+	Encoding and writing the file…	正在编码并写入文件…
+@plural	{n} more export waiting|{n} more exports waiting	另有 {n} 个导出等待中
+	Continue in Background	在后台继续
+	Cancel Export	取消导出
+@msg	Export cancelled	已取消导出
 # Paragraph panel menu › Justification…
 	Desired	所需
 	Word Spacing:	字间距：

crates/ui-egui/src/i18n/zh-hant.tsv

@@ -4077,6 +4077,12 @@ lighting	Light	光源
 	Enable Guides for 9-Slice Scaling	啟用 9-slice 縮放參考線
 	Persistent	持久
 	Library Panel Options	資料庫面板選項
+	Artboard {n} of {total}	工作區域 {n} / {total}
+	Encoding and writing the file…	正在編碼並寫入檔案…
+@plural	{n} more export waiting|{n} more exports waiting	另有 {n} 個匯出等待中
+	Continue in Background	在背景繼續
+	Cancel Export	取消匯出
+@msg	Export cancelled	已取消匯出
 # Paragraph panel menu › Justification…
 	Desired	所需
 	Word Spacing:	字間距：

crates/ui-egui/src/io.rs

@@ -3,7 +3,9 @@
 
 use serde_json::{Value, json};
 use vectorcraft_doc::SavedView;
+use vectorcraft_doc::cancel;
 use vectorcraft_engine::EngineError;
+use vectorcraft_engine::cmd::fileio::progress::{self, Progress};
 use vectorcraft_engine::cmd::fileio::{self, Format, SAVE_FORMATS, SaveMode, SavePlan, TEMPLATE_FORMATS};
 
 use crate::background::{self, Writer};
@@ -675,6 +677,25 @@ pub fn recent_files(app: &VectorcraftApp) -> &[String] {
     &r[..r.len().min(app.session.prefs.recent_files_count as usize)]
 }
 
+/// The status once an export was cancelled.
+pub const EXPORT_CANCELLED: &str = "Export cancelled";
+
+/// File → Cancel Export (the progress dialog's Cancel): every export running in the background
+/// stops and writes nothing more → `{cancelled: n}`.
+pub fn cancel_exports(app: &mut VectorcraftApp) -> Value {
+    let n = app.background.cancel_exports();
+    if n > 0 {
+        app.status(EXPORT_CANCELLED);
+    }
+    json!({ "cancelled": n })
+}
+
+/// The progress dialog's Continue in Background: the exports go on, shown in the status bar only
+/// → `{hidden: n}`.
+pub fn hide_exports(app: &mut VectorcraftApp) -> Value {
+    json!({ "hidden": app.background.hide_exports() })
+}
+
 /// Export the active document in `format` (default: the path's extension, else PNG) with the
 /// `document.export` options in `params` (artboard, range, useArtboards, selectedOnly, ppi, SVG
 /// options…): every file it writes (one per artboard, linked images) goes next to `path`. The
@@ -704,18 +725,31 @@ pub fn export(app: &mut VectorcraftApp, format: Option<&str>, path: Option<Strin
     // Background Export: encoded and written from this snapshot while editing goes on.
     let label = format!("Exporting {}", fileio::file_name(&path));
     let (params, target) = (params.clone(), path.clone());
+    // The progress dialog's counts and Cancel: a cancelled export stops drawing and never starts
+    // writing.
+    let progress = Progress::new();
+    let (reporting, asked) = (progress.clone(), progress.clone());
     let work = move |write: Writer| {
-        let enc = fileio::encode_all(&doc, f.id, &params).map_err(|e| e.to_string())?;
-        let files = write_encoded(write, &doc, &path, &enc)?;
-        let mut out = json!({ "path": files.first().unwrap_or(&path), "warnings": enc.warnings });
-        if files.len() > 1 {
-            out["files"] = json!(files);
-        }
-        Ok(out)
+        progress::scope(&reporting, || {
+            cancel::check().map_err(|e| e.to_string())?;
+            let enc = fileio::encode_all(&doc, f.id, &params).map_err(|e| e.to_string())?;
+            cancel::check().map_err(|e| e.to_string())?;
+            let files = write_encoded(write, &doc, &path, &enc)?;
+            let mut out = json!({ "path": files.first().unwrap_or(&path), "warnings": enc.warnings });
+            if files.len() > 1 {
+                out["files"] = json!(files);
+            }
+            Ok(out)
+        })
     };
     let enabled = app.session.prefs.background_export;
     let failed = target.clone();
-    let mut r = background::run(app, enabled, label, None, work, move |app, r| {
+    let mut r = background::run_with_progress(app, enabled, label, None, Some(progress), work, move |app, r| {
+        // A file written before the Cancel arrived is reported as written.
+        if r.is_err() && asked.cancelled() {
+            app.status(EXPORT_CANCELLED);
+            return Ok(json!({ "cancelled": true }));
+        }
         let r = r.inspect_err(|e| report_write_error(app, true, &failed, e))?;
         let what = match r["files"].as_array() {
             Some(files) => format!("{} files", files.len()),

crates/ui-egui/src/lib.rs

@@ -25,6 +25,7 @@ pub mod cursors;
 pub mod dialogs;
 pub mod dock;
 mod edit_toolbar;
+pub mod export_progress;
 pub mod find_font;
 pub mod floating;
 pub mod font_menu;
@@ -1440,6 +1441,7 @@ impl VectorcraftApp {
         dock::floating_panel(self, &ctx);
         floating::show(self, &ctx);
         dialogs::show(self, &ctx);
+        export_progress::show(self, &ctx);
         palette::show(self, &ctx);
         if self.custom_titlebar {
             titlebar::resize_zones(ui);

crates/ui-egui/src/menus.rs

@@ -747,6 +747,18 @@ pub const UI_COMMANDS: &[(&str, &str, &str, &str)] = &[
     ("file.openRecent29", "Open Recent File 29", "", "{}"),
     ("file.openRecent30", "Open Recent File 30", "", "{}"),
     ("file.reveal", "Show in Folder", "", "{} show the document's file in the system file manager (desktop) → {path}"),
+    (
+        "file.cancelExport",
+        "Cancel Export",
+        "",
+        "{} stop every export running in the background (Background Export): an export stops between artboards and writes no file once cancelled → {cancelled: n}",
+    ),
+    (
+        "file.exportInBackground",
+        "Continue in Background",
+        "",
+        "{} close the export progress dialog; the exports go on, shown in the status bar → {hidden: n}",
+    ),
     (
         "ui.dxfOptionsDialog",
         "DXF Options Dialog",
@@ -1101,6 +1113,8 @@ pub fn run_ui_command(app: &mut VectorcraftApp, id: &str, p: &Value) -> Option<R
         "file.newFromTemplate" if p.get("dataBase64").is_none() => io::new_from_template(app, s("path")),
         "file.revert" if p.get("confirmed").and_then(Value::as_bool) != Some(true) => io::ask_revert(app),
         "file.reveal" => io::reveal(app),
+        "file.cancelExport" => Ok(io::cancel_exports(app)),
+        "file.exportInBackground" => Ok(io::hide_exports(app)),
         id if id.starts_with("file.openRecent") => match recent_slot(app, id).cloned() {
             Some(path) => io::open_reporting(app, &path),
             None => Err("no such recent file".into()),
@@ -2225,6 +2239,7 @@ pub fn enabled(app: &VectorcraftApp, id: &str) -> bool {
         "type.bold" | "type.italic" => crate::panels::character::text_style(app).is_some(),
         id if crate::panels::paragraph::ALIGN_COMMANDS.iter().any(|c| c.0 == id) => crate::panels::character::text_style(app).is_some(),
         "file.reveal" => app.services.reveal.is_some() && app.session.active().is_some_and(|d| d.path.is_some()),
+        "file.cancelExport" | "file.exportInBackground" => app.background.jobs.iter().any(|j| j.progress.is_some() && !j.cancelled()),
         "file.place"
         | "file.export.svg"
         | "file.export.png"

crates/ui-egui/src/tests_background.rs

@@ -121,6 +121,34 @@ fn exports_run_in_the_background_and_the_preference_turns_both_off() {
     assert!(app.background.jobs.is_empty());
 }
 
+#[test]
+fn a_cancelled_export_writes_nothing() {
+    let (gate, writing) = (Gate::default(), Gate::default());
+    let files = Files::default();
+    let (f, g, w) = (files.clone(), gate.clone(), writing.clone());
+    let services = Services {
+        write_shared: Some(Arc::new(move |p: &str, b: &[u8]| {
+            w.open();
+            g.wait();
+            f.lock().unwrap().push((p.to_string(), b.to_vec()));
+            Ok(())
+        })),
+        ..Default::default()
+    };
+    let mut app = VectorcraftApp::new(Session::new(), services);
+    app.run("file.new", json!({"width": 100, "height": 100})).unwrap();
+    // The first export holds the worker at the gate, past its last check: it still writes.
+    io::export(&mut app, Some("svg"), Some("/out/first.svg".into()), &json!({})).unwrap();
+    writing.wait();
+    io::export(&mut app, Some("png"), Some("/out/second.png".into()), &json!({})).unwrap();
+    assert_eq!(app.run("file.cancelExport", json!({})).unwrap()["cancelled"], 2);
+    assert_eq!(app.run("file.cancelExport", json!({})).unwrap()["cancelled"], 0, "nothing left to cancel");
+    gate.open();
+    background::wait_all(&mut app);
+    assert_eq!(written(&files), ["/out/first.svg"]);
+    assert_eq!(app.ui.status, io::EXPORT_CANCELLED);
+}
+
 #[test]
 fn quitting_waits_for_background_saves() {
     let gate = Gate::default();

docs/gaps.md

@@ -1,6 +1,6 @@
 # Gaps
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-17 · **Change:** minor (3D lighting: one to ten colored lights, smooth colored Inflate, legacy white-light appearance preserved; surface batching and restored seam minimum; scores and estimates unchanged; Blend spine Anchor Point conversions, selection/stacking priority and Shift regression coverage (#2544); scores and hours unchanged; transparency grid visibility saved in native documents, #1968; G6: MCP cancellation, progress notifications and busy answers during long exports, #2165, #2171, #2172; EPS editing data: legacy mesh corners, vector opacity masks and compound member paint retained; raster page comparison filters minification without relaxing limits; scores and hours unchanged; correction: quick Image Trace presets leave the panel as it was, the Image Trace button opens it; batch exporting, #1935; G2: Effect › Sketch › Halftone Pattern; Photoshop filters 30/57, 27 remaining (22–38 h); G5: Symbol Options Export Type (Graphic / Movie Clip); G1: Smart Guides line extension, #2120; G16: Brazilian Portuguese catalog complete under the tests, #1914; Localization 71% → 74%, hours 55–90 → 50–85; G6: image variables landed, estimate 8–14 → 6–12 h; Warp Options controls verified by focused checks and original-image review; estimates unchanged; existing-guide Escape cancellation validated 2026-10-14; scores and hours unchanged; open-path anchor Delete keeps surviving runs separate; estimates unchanged; Artboard tab-switch follow-up historically validated on `a0671777`; scores and hours unchanged; Artboard clean active-tab close/Delete follow-up validated 2026-10-15; G13: Object › Intertwine landed, #1763; no entry closed, estimates unchanged; MCP `add_text` exposes the existing `vertical` option for point, area and path type; horizontal remains the default; scores and hours unchanged; Vertical fullwidth question and exclamation marks keep their nominal glyph upright when the font has no vertical alternate; scores and hours unchanged.; G1: Curvature curve geometry, #1236 in part; Width-point finite-arithmetic follow-up validated; scores and hours unchanged; Image Trace adjustment discovery; G9: legacy `.ai` of version 7 saved with type as text and hidden objects kept, legacy type read, #868; estimate unchanged; Revolve: automatic smooth shading and default-on Cap with continuous rims; later 2026-10-14: G8 untrusted files, #1852, #1862–#1873; G11 anchor X/Y/W/H, #1824, Snap to Grid over Snap to Pixel, #1816, redo during a drag, #1719, Dim Images, #1683, failed-save dialog, #1685; gaps noted for reporters: G1 Warp Options for Effect › Warp, #1760, Color Picker Tab order, #1692, key anchor, #1636; G7 custom toolbars, #1759, workspace panel widths, #1753; G11 Shape Builder gaps between closed shapes, #1691, interior anchor delete; G13 Intertwine, #1763, gradient mesh from an image, #1676, Image Trace radial gradients, #1849; G12 duplicated line removed; no entry closed, estimates unchanged; verified PngSuite downloads, #1729; synthetic control-input budgets, #1709; 2026-10-14 fixes: G11 anchor Align and Distribute, #1636, Delete and selection, #1674, #1666, #1743, #1686, Roughen and Scribble, #1643, #1648; G8 file and input hardening, #1776–#1783, #1786, #1807; G10 Wayland cursors and the Windows title bar, unconfirmed, #1645, #1758; no entry closed, estimates unchanged; later 2026-10-13 fixes, #1570, #1578, #1590, #1613, #1615, #1616, #1620 in part, #1602 in part; no entry closed, estimates unchanged; TIFF is available in Export for Screens and Asset Export with shared format settings; scores and hours unchanged; G1/M11: Artboard deletion and history selection normalization; history regressions and full workspace CI pass; scores and hours unchanged; Character styles retain explicit Auto leading, propagate resets and preserve local leading overrides; scores and hours unchanged; Width Point Edit: Shift-double-click enables adjoining adjustment; plain double-click keeps it off; scores and hours unchanged; G12: Identify Objects By acts, #394; ~16 → ~15 prefs still inert; G12: Appearance of Black › Printing / Exporting acts, #394; ~16 → ~15 prefs still inert; control transport deadlines, #1726; G1: Average and Join in one step with a corner or smooth choice added as missing (it was listed as done in ui-parity.md); Join after Average, #1533; guide objects, #1534; Keyboard Shortcuts, #1539; G9 and G11 fixes, #1528, #1530, #1544, #1553, #1512, #1537; estimates unchanged; Direct Selection anchor precedence, #1508; dialog slider rails, #1483; template layers in Outline view, #1486; Tabs panel stop drags, #1458; type that does not fit its frame is reported, #1471; 3D on outlined type, #1481, Twist range, #1524, twisted walls, #1525; print-size images, #1517; French catalog, #1511; estimates unchanged; G1: Split Into Grid options, #1462, Transform Objects and Reflect's angle, #1448 and #1460, Pathfinder on a group, #1450, valueLine truncated
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-17 · **Change:** minor (G12: Background Export progress dialog with Cancel, #2564; no entry closed, estimates unchanged; 3D lighting: one to ten colored lights, smooth colored Inflate, legacy white-light appearance preserved; surface batching and restored seam minimum; scores and estimates unchanged; Blend spine Anchor Point conversions, selection/stacking priority and Shift regression coverage (#2544); scores and hours unchanged; transparency grid visibility saved in native documents, #1968; G6: MCP cancellation, progress notifications and busy answers during long exports, #2165, #2171, #2172; EPS editing data: legacy mesh corners, vector opacity masks and compound member paint retained; raster page comparison filters minification without relaxing limits; scores and hours unchanged; correction: quick Image Trace presets leave the panel as it was, the Image Trace button opens it; batch exporting, #1935; G2: Effect › Sketch › Halftone Pattern; Photoshop filters 30/57, 27 remaining (22–38 h); G5: Symbol Options Export Type (Graphic / Movie Clip); G1: Smart Guides line extension, #2120; G16: Brazilian Portuguese catalog complete under the tests, #1914; Localization 71% → 74%, hours 55–90 → 50–85; G6: image variables landed, estimate 8–14 → 6–12 h; Warp Options controls verified by focused checks and original-image review; estimates unchanged; existing-guide Escape cancellation validated 2026-10-14; scores and hours unchanged; open-path anchor Delete keeps surviving runs separate; estimates unchanged; Artboard tab-switch follow-up historically validated on `a0671777`; scores and hours unchanged; Artboard clean active-tab close/Delete follow-up validated 2026-10-15; G13: Object › Intertwine landed, #1763; no entry closed, estimates unchanged; MCP `add_text` exposes the existing `vertical` option for point, area and path type; horizontal remains the default; scores and hours unchanged; Vertical fullwidth question and exclamation marks keep their nominal glyph upright when the font has no vertical alternate; scores and hours unchanged.; G1: Curvature curve geometry, #1236 in part; Width-point finite-arithmetic follow-up validated; scores and hours unchanged; Image Trace adjustment discovery; G9: legacy `.ai` of version 7 saved with type as text and hidden objects kept, legacy type read, #868; estimate unchanged; Revolve: automatic smooth shading and default-on Cap with continuous rims; later 2026-10-14: G8 untrusted files, #1852, #1862–#1873; G11 anchor X/Y/W/H, #1824, Snap to Grid over Snap to Pixel, #1816, redo during a drag, #1719, Dim Images, #1683, failed-save dialog, #1685; gaps noted for reporters: G1 Warp Options for Effect › Warp, #1760, Color Picker Tab order, #1692, key anchor, #1636; G7 custom toolbars, #1759, workspace panel widths, #1753; G11 Shape Builder gaps between closed shapes, #1691, interior anchor delete; G13 Intertwine, #1763, gradient mesh from an image, #1676, Image Trace radial gradients, #1849; G12 duplicated line removed; no entry closed, estimates unchanged; verified PngSuite downloads, #1729; synthetic control-input budgets, #1709; 2026-10-14 fixes: G11 anchor Align and Distribute, #1636, Delete and selection, #1674, #1666, #1743, #1686, Roughen and Scribble, #1643, #1648; G8 file and input hardening, #1776–#1783, #1786, #1807; G10 Wayland cursors and the Windows title bar, unconfirmed, #1645, #1758; no entry closed, estimates unchanged; later 2026-10-13 fixes, #1570, #1578, #1590, #1613, #1615, #1616, #1620 in part, #1602 in part; no entry closed, estimates unchanged; TIFF is available in Export for Screens and Asset Export with shared format settings; scores and hours unchanged; G1/M11: Artboard deletion and history selection normalization; history regressions and full workspace CI pass; scores and hours unchanged; Character styles retain explicit Auto leading, propagate resets and preserve local leading overrides; scores and hours unchanged; Width Point Edit: Shift-double-click enables adjoining adjustment; plain double-click keeps it off; scores and hours unchanged; G12: Identify Objects By acts, #394; ~16 → ~15 prefs still inert; G12: Appearance of Black › Printing / Exporting acts, #394; ~16 → ~15 prefs still inert; control transport deadlines, #1726; G1: Average and Join in one step with a corner or smooth choice added as missing (it was listed as done in ui-parity.md); Join after Average, #1533; guide objects, #1534; Keyboard Shortcuts, #1539; G9 and G11 fixes, #1528, #1530, #1544, #1553, #1512, #1537; estimates unchanged; Direct Selection anchor precedence, #1508; dialog slider rails, #1483; template layers in Outline view, #1486; Tabs panel stop drags, #1458; type that does not fit its frame is reported, #1471; 3D on outlined type, #1481, Twist range, #1524, twisted walls, #1525; print-size images, #1517; French catalog, #1511; estimates unchanged; G1: Split Into Grid options, #Line truncated
 
 Every known shortfall against Illustrator, one entry each, **ranked by how much it stops a professional from
 switching**. This is the work list: unless you were given a task, pick the highest-ranked gap you can make
@@ -202,6 +202,7 @@ from G14 and the budget run of G15: **~170–270 h** one agent, ~50–80 h wall
 
 ## G12 Preferences and panels that don't act yet
 
+- **Done (2026-10-17):** Background Export shows its progress in a dialog with Cancel and Continue in Background (#2564), on the shared cancel token (#2546); a cancelled export writes no file. Save As, Export for Screens and Export Selection don't show it yet. Estimate unchanged.
 - **Done:** quick Image Trace presets trace at once and leave the panel as it was; the Image Trace button (Control bar, Properties) opens the controls with Threshold and Advanced (Paths, Corners, Noise), as the public documentation describes (<https://helpx.adobe.com/illustrator/using/image-trace-results-optimization.html>). Other context-specific Properties gaps remain.
 
 - **Missing:** ~14 Preferences options stored but not acted on (#394: Open
@@ -349,6 +350,7 @@ from G14 and the budget run of G15: **~170–270 h** one agent, ~50–80 h wall
 | Date | Change | Summary |
 |---|---|---|
 | 2026-10-17 | minor | Blend spine Anchor Point conversions, selection/stacking priority and Shift regression coverage (#2544); scores and hours unchanged. Windows native canvas checks and screenshots reviewed in PR #2643. |
+| 2026-10-17 | minor | G12: Background Export progress dialog with Cancel and Continue in Background (#2564); no entry closed, estimates unchanged |
 | 2026-10-16 | minor | Native documents restore transparency grid visibility (#1968); save/open regression covers on/off, old files and SVG; scores and hours unchanged (estimated) |
 | 2026-10-16 | minor | G6: MCP cancellation, progress notifications and a busy answer during long exports (#2165, #2171, #2172); no entry closed, estimates unchanged |
 | 2026-10-16 | minor | G11: PDF export of a CMYK document reports its RGB colours and non-CMYK images, with a count, in the export warnings (#2162); no entry closed, estimates unchanged |

docs/ui-parity.md

@@ -1,6 +1,6 @@
 # UI and interaction parity
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-17 · **Change:** minor (3D lighting: one to ten colored lights, smooth colored Inflate, legacy white-light appearance preserved; surface batching and restored seam minimum; scores and estimates unchanged; Blend spine Anchor Point conversions, selection/stacking priority and Shift regression coverage (#2544); scores and hours unchanged; Artboard Options' X and Y with a reference point, #1876; scores unchanged; library panels: one per library, dockable and tabbable, with Persistent, #2603; the Selection tool threads text from the out port, #2572 in part; scores unchanged; Group Selection picks and moves one path of a compound path, #2441 in part; the Move dialog opens on the last move and its last checkboxes; scores unchanged; transparency grid visibility saved in native documents, #1968; Live Corners radius up to the neighbouring cuts, #2332; Image Trace quick presets: wording corrected to the shipped behaviour, the Image Trace button opens the controls; batch exporting, #1935; document window scroll bars, #2322; Anchor Point tool: a click on a handle end retracts that handle only, #2267; scores unchanged; Smart Guides: the dragged end of a straight segment keeps to its extension at any angle, #2120; Warp Options controls verified by focused checks and original-image review; estimates unchanged; existing-guide Escape cancellation validated 2026-10-14; scores and hours unchanged; open-path anchor Delete keeps surviving runs separate; estimates unchanged; Artboard tab-switch follow-up historically validated on `a0671777`; scores and hours unchanged; Artboard clean active-tab close/Delete follow-up validated 2026-10-15; Curvature curve geometry, #1236 in part; Width-point finite-arithmetic follow-up validated; scores and hours unchanged; Image Trace adjustment discovery; later 2026-10-14 merges: macOS save sheet Format menu back to missing, #1855, #866 reopened; anchor X/Y/W/H in the Transform panel, Properties and Control bar, #1824; Snap to Grid over Snap to Pixel, #1816; toolbar labels, columns and the All Tools drawer, #1751; Actions panel selection, #1629 in part; scores unchanged; 2026-10-14 merges: anchor Align and Distribute, #1636; Delete on closed paths and whole objects, #1674; selection inside isolation, #1666; Escape in a Direct Selection drag and while typing, #1743, #1686; Pen clicks under 3 px, #1663; [ and ] on more tools, #1661 in part; fields commit on click away, #1787; command search keys, #1757; a guide's position in the Transform panel is a convenience with no parity claim, #1659; scores unchanged; intersect Smart Guides for drawn points and dragged anchors, #1602 in part; a ruler guide's position in the Transform panel, #1597 in part; Symbol Options before New Symbol, #1560; tool flyout widths, #1616; Pathfinder Trim, Merge and Crop strokes, #1570; scores unchanged; G1/M11: Artboard deletion and history selection normalization; history regressions and full workspace CI pass; scores and hours unchanged; Width Point Edit: Shift-double-click enables adjoining adjustment; plain double-click keeps it off; scores and hours unchanged; per-corner radius fields with a link toggle, split from #1594; Join merges anchors lying on one another, #1533; correction: Average and Join with a corner or smooth choice is missing, not done; guide objects take the guide colour and style and Lock Guides, #1534; Keyboard Shortcuts lists commands outside the menus, #1539; round corners next to curves and the Smooth tool's reach, #1512; Make Compound Path on a group, #1537; dialog slider rails, #1483; template layers stay in Preview in Outline view, #1486; Direct Selection takes the selected object's anchor where anchors coincide, #1508; Tabs panel stop drags, #1458; Split Into Grid dialog, #1462; Transform Objects and Reflect's angle, #1448 and #1460; Pathfinder panel on a group, #1450; value fields: readable selection, #1465 in part, and a focused field follows its value, #1457; scores unchanged; Transform dialogs have a live Preview and step with the arrow keys, #1412; transform tools, dialogs and Move act on direct-selected anchors, #1408; the bounding box hides during a corner drag, #1229; scores unchanged; dialogs focus their first field on every open, #1367, and a first field that starts greyed out once it is enabled, #1395; scores unchanged; Rectangular Grid and Polar Grid click dialogs take the skew, frame, compound path and Fill Grid options, #1377 in part, score unchanged; Live Corners: a Direct Selection click on a widget selects its corner, #1239; custom ruler origin, #1212; Artboard tool clicks fit the topmost editable object in one undo step (#1227); scores unchanged; Pathfinder single-result source names and SVG IDs retained, #1293; DXF control-point SPLINE closure read, #1299 follow-up; Document Setup: Edit Artboards closes the modal after applying valid settings; pointer-click regressions; scores and hours unchanged; Artboards: Escape Line truncated
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-17 · **Change:** minor (Background Export progress dialog with Cancel, #2564; scores unchanged; 3D lighting: one to ten colored lights, smooth colored Inflate, legacy white-light appearance preserved; surface batching and restored seam minimum; scores and estimates unchanged; Blend spine Anchor Point conversions, selection/stacking priority and Shift regression coverage (#2544); scores and hours unchanged; Artboard Options' X and Y with a reference point, #1876; scores unchanged; library panels: one per library, dockable and tabbable, with Persistent, #2603; the Selection tool threads text from the out port, #2572 in part; scores unchanged; Group Selection picks and moves one path of a compound path, #2441 in part; the Move dialog opens on the last move and its last checkboxes; scores unchanged; transparency grid visibility saved in native documents, #1968; Live Corners radius up to the neighbouring cuts, #2332; Image Trace quick presets: wording corrected to the shipped behaviour, the Image Trace button opens the controls; batch exporting, #1935; document window scroll bars, #2322; Anchor Point tool: a click on a handle end retracts that handle only, #2267; scores unchanged; Smart Guides: the dragged end of a straight segment keeps to its extension at any angle, #2120; Warp Options controls verified by focused checks and original-image review; estimates unchanged; existing-guide Escape cancellation validated 2026-10-14; scores and hours unchanged; open-path anchor Delete keeps surviving runs separate; estimates unchanged; Artboard tab-switch follow-up historically validated on `a0671777`; scores and hours unchanged; Artboard clean active-tab close/Delete follow-up validated 2026-10-15; Curvature curve geometry, #1236 in part; Width-point finite-arithmetic follow-up validated; scores and hours unchanged; Image Trace adjustment discovery; later 2026-10-14 merges: macOS save sheet Format menu back to missing, #1855, #866 reopened; anchor X/Y/W/H in the Transform panel, Properties and Control bar, #1824; Snap to Grid over Snap to Pixel, #1816; toolbar labels, columns and the All Tools drawer, #1751; Actions panel selection, #1629 in part; scores unchanged; 2026-10-14 merges: anchor Align and Distribute, #1636; Delete on closed paths and whole objects, #1674; selection inside isolation, #1666; Escape in a Direct Selection drag and while typing, #1743, #1686; Pen clicks under 3 px, #1663; [ and ] on more tools, #1661 in part; fields commit on click away, #1787; command search keys, #1757; a guide's position in the Transform panel is a convenience with no parity claim, #1659; scores unchanged; intersect Smart Guides for drawn points and dragged anchors, #1602 in part; a ruler guide's position in the Transform panel, #1597 in part; Symbol Options before New Symbol, #1560; tool flyout widths, #1616; Pathfinder Trim, Merge and Crop strokes, #1570; scores unchanged; G1/M11: Artboard deletion and history selection normalization; history regressions and full workspace CI pass; scores and hours unchanged; Width Point Edit: Shift-double-click enables adjoining adjustment; plain double-click keeps it off; scores and hours unchanged; per-corner radius fields with a link toggle, split from #1594; Join merges anchors lying on one another, #1533; correction: Average and Join with a corner or smooth choice is missing, not done; guide objects take the guide colour and style and Lock Guides, #1534; Keyboard Shortcuts lists commands outside the menus, #1539; round corners next to curves and the Smooth tool's reach, #1512; Make Compound Path on a group, #1537; dialog slider rails, #1483; template layers stay in Preview in Outline view, #1486; Direct Selection takes the selected object's anchor where anchors coincide, #1508; Tabs panel stop drags, #1458; Split Into Grid dialog, #1462; Transform Objects and Reflect's angle, #1448 and #1460; Pathfinder panel on a group, #1450; value fields: readable selection, #1465 in part, and a focused field follows its value, #1457; scores unchanged; Transform dialogs have a live Preview and step with the arrow keys, #1412; transform tools, dialogs and Move act on direct-selected anchors, #1408; the bounding box hides during a corner drag, #1229; scores unchanged; dialogs focus their first field on every open, #1367, and a first field that starts greyed out once it is enabled, #1395; scores unchanged; Rectangular Grid and Polar Grid click dialogs take the skew, frame, compound path and Fill Grid options, #1377 in part, score unchanged; Live Corners: a Direct Selection click on a widget selects its corner, #1239; custom ruler origin, #1212; Artboard tool clicks fit the topmost editable object in one undo step (#1227); scores unchanged; Pathfinder single-result source names and SVG IDs retained, #1293; DXF control-point SPLINE closure read, #1299 follow-up; Document Setup: Edit Artboards closes the modal after applying valid settings; pLine truncated
 
 How VectorCraft's tools, handles, snapping and panels behave next to Illustrator's. A vector illustrator's
 trust is in the details: where a handle lands, what Shift and Alt do mid-drag, what a smart guide snaps to,
@@ -226,6 +226,7 @@ panel-menu commands such as Break Link to Symbol), so they can be given shortcut
 | Blend panel (30.7) | partial | Window › Blend: Make, Spacing, Orientation, Reverse Front to Back, Reverse Spine, Replace Spine, Expand and Release, running the Object › Blend commands; the easing and color controls are missing |
 | SVG Interactivity, Retype, Comments, Version History panels | missing | the last two are cloud features (out of scope) |
 | Workspaces (save, reset, switch) | done | |
+| Background Export: a progress dialog with the file name, the artboard count and a bar (busy for one artboard and for formats made in one go), Cancel (Esc) and Continue in Background; it opens after 0.4 s and never over another dialog. A cancelled export writes no file | done | #2564; on the shared `vectorcraft_doc::cancel` token (#2546), so a cancelled render keeps no half-drawn pattern tile or effect raster. The bar moves between artboards, not within one. Save As, Export for Screens and Export Selection don't show it yet |
 | Swatch and graphic style library panels: each library opens in a panel of its own, several at once, that floats, groups, docks and closes like any panel; opening an open library brings its panel forward; Previous / Next Library change the library in place; the panel menu's Persistent reopens the panel at startup with its view and find field (a library loaded from a file is read again, a missing file is skipped with a status-bar note) | done | #2603; panel ids `library:<kind>:<id>`, `ui.libraryPanel {panel, library?, view?, showFind?, persistent?}`; the library panels have no sort option, as before |
 | DXF export/import preserves intended curve closure | done | #1299; R13–2018 closed SPLINE bit set/read; an open curve ending at its start stays open; knots and control points unchanged; native CIRCLE/ARC export and CNC preset remain pending |
 | macOS save sheet: choose the format from a menu | done | #866; the save panel is VectorCraft's own `NSSavePanel` with its Format menu set before the sheet opens (`apps/vectorcraft/src/mac_save_format.rs`); #1855 had withdrawn the menu that was added after the sheet began, which made Save As, Save a Copy and the first Save show no sheet |
@@ -248,6 +249,7 @@ re-measure of the panels added since. Slider rails show on Medium Dark (#1808, #
 |---|---|---|
 | 2026-10-17 | minor | Blend spine Anchor Point conversions, selection/stacking priority and Shift regression coverage (#2544); scores and hours unchanged. Windows native canvas checks and screenshots reviewed in PR #2643. |
 | 2026-10-17 | minor | Artboard Options has X and Y beside a reference point locator, counted from the ruler origin as the Transform panel's are; a typed X or Y moves the artboard's reference point there and a new Width or Height keeps it in place (#1876); scores unchanged (estimated) |
+| 2026-10-17 | minor | Background Export shows a progress dialog with Cancel and Continue in Background (#2564), built on the shared cancel token of #2546; scores and hours unchanged (estimated) |
 | 2026-10-17 | minor | Library panels (#2603): each swatch or graphic style library opens in its own dockable, tabbable panel, several at once; the panel menu's Persistent reopens a panel at startup with its view and find field, a library loaded from a file read again from its path; scores unchanged (estimated) |
 | 2026-10-17 | minor | Selection tool: clicking the red out port of overflowing area type, then a closed path, empty canvas or a dragged rectangle threads the text there (#2572 in part); Escape cancels. Scores and hours unchanged. |
 | 2026-10-17 | minor | Group Selection picks one path of a compound path (the outer shape or a hole) and moves it on its own; a second click adds the compound path (#2441, in part) |