A test for review: an Outer Glow made coarser over its whole reach is
kept for any pan, since its grid starts at the reach's first whole
device pixel, which a whole-pixel pan moves with the art. After pans
that aren't multiples of its scale (2 and 3), the kept raster draws
exactly what a fresh renderer draws.
Co-Authored-By: Claude Opus 5.5 <[email protected]>