Fix #2120: Smart Guides keep a dragged end of a straight segment on its extension at any angle

crates/tools/src/direct.rs

@@ -1528,6 +1528,29 @@ mod tests {
         assert_eq!(drag(&mut t, &c, (300.0, 300.0), (201.0, 199.0), none).0, json!({"dx": -99.0, "dy": -101.0}));
     }
 
+    /// #2120: the end of a slanted straight line, dragged roughly along it, stays on its direction
+    /// (Line Extension) and the guide runs along it from the other end.
+    #[test]
+    fn dragged_end_of_a_slanted_line_stays_on_its_direction() {
+        let (mut d, _) = doc_with_rect();
+        let l = d.layers[0].id;
+        let id = d.alloc_id();
+        let line = vectorcraft_geom::shapes::line(Point::new(300.0, 400.0), Point::new(380.0, 340.0));
+        d.insert(Some(l), 1, vectorcraft_doc::Node::path(id, line, vectorcraft_doc::Appearance::default_art())).unwrap();
+        let p = paint();
+        let end = anchors_of(id, &[(0, 1)]);
+        let c = cx(&d, &end, &p);
+        let mut t = DirectSelectionTool::new(false);
+        t.pointer(&c, &PointerEvent::new(PointerKind::Down, 380.0, 340.0));
+        let a = t.pointer(&c, &PointerEvent::new(PointerKind::Drag, 421.5, 312.0));
+        let Some(Action::Preview(_, v)) = a.last() else { panic!("{a:?}") };
+        let (dx, dy) = (v["dx"].as_f64().unwrap(), v["dy"].as_f64().unwrap());
+        assert!((dx - 40.0).abs() < 1e-9 && (dy + 30.0).abs() < 1e-9, "{v}");
+        let guides: Vec<(Point, Point)> =
+            t.overlays(&c).into_iter().filter_map(|o| if let Overlay::Line { a, b, .. } = o { Some((a, b)) } else { None }).collect();
+        assert!(matches!(guides[..], [(a, b)] if a == Point::new(300.0, 400.0) && (b - Point::new(420.0, 310.0)).hypot() < 1e-9), "{guides:?}");
+    }
+
     /// Group Selection (and Direct Selection on a whole path) moves objects snapping as the
     /// Selection tool does: B's left side lines up with A's right one.
     #[test]

crates/tools/src/guides.rs

@@ -82,6 +82,10 @@ pub struct Targets {
     /// The bounds of the objects a moved selection spaces itself evenly with (Spacing Guides):
     /// gathered only for moves ([`Self::for_move`]).
     boxes: Vec<Rect>,
+    /// Line Extension: the lines a single dragged anchor keeps to, along the straight segments
+    /// it ends, as the end that stays put and the unit direction towards the dragged one
+    /// ([`Self::for_anchor_drag`]).
+    extensions: Vec<(Point, Vec2)>,
     /// How the guides these targets produce look.
     style: GuideStyle,
 }
@@ -264,10 +268,14 @@ impl Targets {
 
     /// Targets for dragging the direct-selected anchors of `sel` (and its objects selected as a
     /// whole): the other art, its path segments too, and the anchors and segments that stay put on
-    /// the paths being reshaped (their bounds move along, so they are no targets).
+    /// the paths being reshaped (their bounds move along, so they are no targets). A single anchor
+    /// also keeps to the extensions of the straight segments it ends (#2120).
     pub fn for_anchor_drag(doc: &Document, sel: &Selection) -> Self {
         let mut t = Self::collect_inner(doc, &sel.objects, None, None, Gather::Segments);
         let (mut anchors, mut segments) = (BUDGET, BUDGET);
+        // With several anchors moving, the one under the pointer is not known here, and the
+        // others' extensions don't run through it.
+        let single = sel.objects.len() <= 1 && sel.anchors.values().map(|s| s.len()).sum::<usize>() == 1;
         for (id, set) in &sel.anchors {
             let Some(path) = doc.node(*id).and_then(|n| n.path_data()) else { continue };
             for (si, sp) in path.subpaths.iter().enumerate() {
@@ -277,11 +285,30 @@ impl Targets {
                     anchors -= 1;
                 }
                 t.push_segments(sp, moving, &mut segments);
+                if single {
+                    t.push_extensions(sp, moving);
+                }
             }
         }
         t.index()
     }
 
+    /// The extensions of the straight segments of `sp` with one end among the anchors `moving`
+    /// accepts and the other staying put. Horizontal and vertical ones are left out: lining up
+    /// with the other end already keeps the point on them, and says "align".
+    fn push_extensions(&mut self, sp: &SubPath, moving: impl Fn(usize) -> bool) {
+        let n = sp.anchors.len();
+        for seg in (0..sp.segment_count()).filter(|&seg| moving(seg) != moving((seg + 1) % n) && sp.segment_is_line(seg)) {
+            let c = sp.segment(seg);
+            let (fixed, dragged) = if moving(seg) { (c.p3, c.p0) } else { (c.p0, c.p3) };
+            let d = dragged - fixed;
+            let len = d.hypot();
+            if len.is_finite() && d.x.abs() > 1e-9 * len && d.y.abs() > 1e-9 * len {
+                self.extensions.push((fixed, d / len));
+            }
+        }
+    }
+
     /// The segments of `sp` that stay put while the anchors `moving` accepts move, as targets, at
     /// most `budget` of them (counted down).
     fn push_segments(&mut self, sp: &SubPath, moving: impl Fn(usize) -> bool, budget: &mut usize) {
@@ -360,6 +387,7 @@ impl Targets {
         self.xs.clear();
         self.ys.clear();
         self.segments.clear();
+        self.extensions.clear();
         self
     }
 
@@ -446,11 +474,11 @@ impl Targets {
         if let Some(q) = self.on_segment(p, tol) {
             return (q, self.label(q, Kind::Edge.label()).into_iter().collect());
         }
-        if let Some(f) = from
-            && let Some((dir, q)) = f.construction(p, tol)
-        {
-            let construction = |q: Point| Overlay::Line { a: f.at, b: q, color: self.style.color, dashed: false };
-            return match self.slide(f.at, dir, q, tol, false) {
+        // A construction guide through the point it leaves, else a dragged segment's extension:
+        // it lands on the guide, sliding into line with a target crossing it nearby.
+        if let Some((at, dir, q)) = from.and_then(|f| f.construction(p, tol).map(|(dir, q)| (f.at, dir, q))).or_else(|| self.extension(p, tol)) {
+            let construction = |q: Point| Overlay::Line { a: at, b: q, color: self.style.color, dashed: false };
+            return match self.slide(at, dir, q, tol, false) {
                 Some((q, target)) => (q, std::iter::once(construction(q)).chain(self.lined_up(q, target)).collect()),
                 None => (q, vec![construction(q)]),
             };
@@ -485,6 +513,19 @@ impl Targets {
         (out, ov)
     }
 
+    /// The segment extension nearest `p`, within `tol` of it (and `p` farther than that from the
+    /// end it starts at): that end, its direction and where `p` lands on it.
+    fn extension(&self, p: Point, tol: f64) -> Option<(Point, Vec2, Point)> {
+        self.extensions
+            .iter()
+            .filter(|(at, _)| at.distance(p) > tol)
+            .map(|&(at, d)| (at, d, at + d * (p - at).dot(d)))
+            .map(|(at, d, q)| (at, d, q, q.distance(p)))
+            .filter(|(.., dist)| *dist <= tol)
+            .min_by(|a, b| a.3.total_cmp(&b.3))
+            .map(|(at, d, q, _)| (at, d, q))
+    }
+
     /// The anchor or centre nearest `p`, within `tol`.
     /// Is a target point (an anchor, a centre) within `tol` of `p`?
     pub(crate) fn has_point_near(&self, p: Point, tol: f64) -> bool {
@@ -1382,6 +1423,47 @@ mod tests {
         assert_eq!(t.snap_point(Point::new(101.0, 99.0), 4.0).0, Point::new(100.0, 100.0), "in line with its neighbours, not on itself");
     }
 
+    /// #2120: the dragged end of a straight segment at any angle lands on the segment's own
+    /// extension (Line Extension), past its other end or short of it, the guide drawn from that
+    /// end; with two anchors moving there is none to keep to.
+    #[test]
+    fn dragged_end_of_a_slanted_line_keeps_to_its_extension() {
+        use vectorcraft_doc::{Appearance, Node};
+        let (mut d, _) = doc_with_rect();
+        let l = d.layers[0].id;
+        let id = d.alloc_id();
+        // From (300, 400) up to (380, 340): along (4, -3), about 37° up.
+        d.insert(
+            Some(l),
+            1,
+            Node::path(id, vectorcraft_geom::shapes::line(Point::new(300.0, 400.0), Point::new(380.0, 340.0)), Appearance::default_art()),
+        )
+        .unwrap();
+        let (mut s, p) = (Selection::default(), paint());
+        s.set([id]);
+        s.anchors.insert(id, [(0, 1)].into_iter().collect());
+        let t = Targets::for_anchor_drag(&d, &s).styled(&cx(&d, &s, &p));
+        // 150 along it (2.5 off), and 50 along it (shorter).
+        for (pointer, on) in [(Point::new(421.5, 312.0), Point::new(420.0, 310.0)), (Point::new(341.5, 372.0), Point::new(340.0, 370.0))] {
+            let (q, ov) = t.snap_point(pointer, 4.0);
+            assert!((q - on).hypot() < 1e-9, "{q:?}");
+            assert_eq!(lines(&ov), vec![(Point::new(300.0, 400.0), q)]);
+        }
+        // Two anchors moving, the middle one staying put: no telling which one the pointer drags,
+        // so neither keeps to the extension of its segment.
+        let id = d.alloc_id();
+        let bent = vectorcraft_geom::PathData::single(SubPath::polyline(
+            &[Point::new(250.0, 450.0), Point::new(300.0, 400.0), Point::new(380.0, 340.0)],
+            false,
+        ));
+        d.insert(Some(l), 1, Node::path(id, bent, Appearance::default_art())).unwrap();
+        let mut s = Selection::default();
+        s.set([id]);
+        s.anchors.insert(id, [(0, 0), (0, 2)].into_iter().collect());
+        let t = Targets::for_anchor_drag(&d, &s);
+        assert_eq!(t.snap_point(Point::new(421.5, 312.0), 4.0), (Point::new(421.5, 312.0), vec![]));
+    }
+
     fn labels(ov: &[Overlay]) -> Vec<&str> {
         ov.iter().filter_map(|o| if let Overlay::Label { text, .. } = o { Some(text.as_str()) } else { None }).collect()
     }

docs/gaps.md

@@ -1,6 +1,6 @@
 # Gaps
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-15 · **Change:** minor (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, value fields, #1457 and #1465 in part; G9: grayscale TIFFs with alpha, #1466 in part; G6: unknown parameter keys refused, #1442; G10: window surfaces past 8192 px, #1459 in part; G15: many-object edits, #1429 in part; estimates unchanged; G16: Vietnamese catalog added, complete under the tests; three key languages remain, 60–100 → 55–90 h; G3: Extrude & Bevel, Inflate and Rotate added, 45–75 → 25–45 h; G9: `.ai` compound path paint, #1410, overprint kept on import, #1388, text-only PDF parts, #1387; G1: Transform dialogs preview, #1412, transforms of direct-selected anchors, #1408, corner drags, #1229; G11: strokes wider than their shape, #1396; estimates unchanged; G9: `.ai` editing-data follow-ups (gradient stops, type placement, short area-type frames), #1390, #1391, #1392; G15: symbol instance art kept between frames, #1386; G1: dialog keyboard focus, #1367 and #1395; estimates unchanged; G9: placed (linked) files read from `.ai` editing data, #1264; G9: gradieLine truncated
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-16 · **Change:** minor (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, value fields, #1457 and #1465 in part; G9: grayscale TIFFs with alpha, #1466 in part; G6: unknown parameter keys refused, #1442; G10: window surfaces past 8192 px, #1459 in part; G15: many-object edits, #1429 in part; estimates unchanged; G16: Vietnamese catalog added, complete under the tests; three key languages remain, 60–100 → 55–90 h; G3: Extrude & Bevel, Inflate and Rotate added, 45–75 → 25–45 h; G9: `.ai` compound path paint, #1410, overprint kept on import, #1388, text-only PDF parts, #1387; G1: Transform dialogs preview, #1412, transforms of direct-selected anchors, #1408, corner drags, #1229; G11: strokes wider than their shape, #1396; estimates unchanged; G9: `.ai` editing-data follow-ups (gradient stops, type placement, short area-type frames), #1390, #1391, #1392; G15: symbol instance art kept between frames, #1386; G1: dialog keyboard focus, #1367 and #1395; estimates unchanged; G9: placed (linked) files read frLine 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
@@ -72,6 +72,7 @@ from G14 and the budget run of G15: **~170–270 h** one agent, ~50–80 h wall
 - **Done (#1253):** adding paint to an unpainted zero-width stroke restores the existing 1 pt default, including new-art defaults and Swap Fill/Stroke. The real Eyedropper inheritance sequence, targeted appearance items, preserved widths and Undo/Redo have regression coverage.
 - **Missing:** Average and Join in one step, with a corner or smooth choice for the joined anchor. `path.average` and `path.join` are separate commands and Join has no such choice (coinciding anchors merge into one since #1533). [ui-parity.md](ui-parity.md) listed "Join with corner/smooth choice" as done until 2026-10-13. About 1–2 h (estimated), inside the estimate below.
 - **Implemented (#1760):** Effect › Warp has a shared style selector with original previews, orientation buttons and percent sliders. Existing effects retain their stack slot and target. Focused checks passed and original captures were reviewed; optional Properties integration and remembered defaults remain outside this change.
+- **Done (#2120):** Smart Guides line extension: dragging the end of a straight segment with Direct Selection, the point snaps to the segment's own direction at any angle and the guide runs along it from the other end. Inside the estimate below.
 - **Missing (noted for reporters, 2026-10-14):** Tab in the Color Picker moves through its fields in order (#1692); aligning anchor points selected with
   Direct Selection to a key anchor (from #1636: they align to their bounds; the current public Align page does
   not say how the key anchor is chosen, so this waits for the owner). Inside the estimate below.
@@ -327,6 +328,7 @@ from G14 and the budget run of G15: **~170–270 h** one agent, ~50–80 h wall
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-16 | minor | G1: Smart Guides line extension for a dragged end of a straight segment, at any angle (#2120); estimate unchanged |
 | 2026-10-14 | minor | G16: Brazilian Portuguese (`pt-br`) catalog complete under the tests (#1914); three key languages remain (Hindi, Arabic, Indonesian), 55–90 → 50–85 h |
 | 2026-10-14 | minor | G6: dataset CSV import/export (`dataset.import` / `dataset.export`); remaining: scripting surface, Batch, graph variables; estimate 6–12 → 4–8 h |
 | 2026-10-14 | minor | G6: image variables (`VariableKind::Image`, `variable.makeImageDynamic`, path values on `dataset.select` keeping bounds); remaining: scripting surface, Batch, graph variables, dataset import/export; estimate 8–14 → 6–12 h |

docs/ui-parity.md

@@ -1,6 +1,6 @@
 # UI and interaction parity
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-14 · **Change:** minor (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 exits editing; an active drag cancels first; shortcut-routing regression; scores and hours unchanged; Simplify preview/counts and valid rewritten-path selection (#1272); parity remains partial; Texture-effect drag redraws optimized (#1257); idle Windows interaction still unverified; scores unchanged; Curvature point display improved (#1236, in part); scores unchanged; Direct Selection: no-op anchor Align preserves Undo, Redo and saved state (#1180 follow-up); Eyedropper cursor distinguished from precise crosshair (#1269); scores unchanged; Eyedropper can read visible locked and outside-isolation sources (#1251); scores unchanged; Direct Selection: independent segment picks and Delete (#1278); scores unchanged; Adding paint to an unpainted zero-width stroke restores the 1 pt default (#1253); scores unchanged; macOS save sheets offer a Format menu, #866; Attributes fill-rule controls edit the compound when a member is selected, #1197; a marquee needs to touch a path, not just lie inside its fill, #1103; earlier: Live Corners round corners between curved sides, #1144) · **Target:** Adobe Illustrator 2026 (30.x)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-16 · **Change:** minor (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 exits editing; an active drag cancels first; shortcut-routing regression; scores and hours unchanged; Simplify preview/counts and valid rewritten-path selection (#1272); parity remains partial; Texture-effect drag redraws optimized (#1257); idle Windows interaction still unverified; scores unchanged; Curvature point display improved (#1236, in part); scores unchanged; Direct Selection: no-op anchor Align preserves Undo, Redo and saved state (#1180 follow-up); Eyedropper cursor distinguished from precise crosshair (#1269); scores unchanged; Eyedropper can read visible locked and outside-isolation sources (#1251); scores unchanged; Direct Selection: independent segment picks and Delete (#1278); scores unchanged; Adding paint to an unpainted zero-width stroke restores the 1 pt default (#1253); scores unchanged; macOS save sheets offer a Format menu, #866; Attributes fill-rule controls edit the compound when a member is selected, #1197; a marquee needs to touch a path, not just lie inside its fill, #1103; earlier: Live Corners round corners between curved sides, #1144) · **Target:** AdLine 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,
@@ -92,6 +92,7 @@ tools, never checked side by side) isn't captured row by row.
 | Anchor/Path labels ("anchor", "center", "path", "align") | done | |
 | "intersect" label and snapping to path intersections | partial | #1658 (part of #1602): a point drawn with the Pen, the shape tools or the other drawing tools and an anchor dragged with Direct Selection snap to where paths and ruler guides cross; a moved selection's own anchors and the Width tool don't |
 | Construction guides at preference angles while drawing | done | #506 |
+| Line extension: the dragged end of a straight segment snaps to the segment's own direction at any angle, past its other end or short of it, with the guide along it | done | #2120; Direct Selection, one anchor dragged (with several, the move has no single direction); horizontal and vertical segments keep lining up with their other end ("align") |
 | Measurement labels while drawing, moving and resizing | partial | sizes and offsets; angle and distance readouts while drawing missing |
 | Spacing guides (equal distances) | partial | for moves (#394); not for resizing or drawing |
 | Snapping tolerance preference | done | |
@@ -226,6 +227,7 @@ re-measure of the panels added since. Slider rails show on Medium Dark (#1808, #
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-16 | minor | Smart Guides: the dragged end of a straight segment snaps to the segment's extension at any angle, with the guide from its other end (#2120); scores and hours unchanged |
 | 2026-10-14 | minor | Effect > Warp: style, orientation and percent controls; focused checks passed and original captures reviewed; scores and hours unchanged |
 | 2026-10-14 | minor | G11: open-path anchor Delete leaves separate surviving runs; dedicated Remove Anchors remains connected. Keyboard and history regression coverage added; scores and hours unchanged. |
 | 2026-10-14 | minor | Curvature: the Curvature tool's curve: each stretch of three points follows the circle through them (handles along its tangent, chord/(3·cos²(α/2)) long, shorter in a turn tighter than 30°), and the ends of an open path curve in, so uneven spacing neither overshoots nor loops; the rubber band, dragged, inserted and converted points use the same rule; the Pencil's fitting unchanged (#1236, in part); scores unchanged (estimated) |