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#893: Shape Builder merges leave no seams on grids of lines

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The planar map merged sweep endpoints within eps into one vertex id but
kept each segment's own copy of the coordinates, so faces meeting at a
vertex could disagree on that corner by ~1e-13. Uniting them then failed
to cancel their shared edge, and a merged strip came back as several
touching subpaths whose stroke drew the inner edges as leftover lines.

Pin every edge's ends to its vertex's canonical position, so faces share
their corners bit for bit. Regression test from the reporter's grid.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Alejandro Londono
2026-10-11 12:24:44 +07:00
committed by bflatastic
co-authored by Claude Opus 5.5
parent a3b6c3d969
commit cfa36fc55f
4 changed files with 86 additions and 15 deletions
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docs/gaps.md
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@@ -1,6 +1,6 @@
# Gaps
> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (scaled text controls corrected, #1034; group font-size preservation deferred) · **Target:** Adobe Illustrator 2026 (30.x)
> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (G11: Shape Builder merge seams on grids of lines fixed, #893; scaled text controls corrected, #1034; group font-size preservation deferred) · **Target:** Adobe Illustrator 2026 (30.x)
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
@@ -88,7 +88,7 @@ from G14 and the budget run of G15: **~170–270 h** one agent, ~50–80 h wall
- **Done:** scaled text's size and horizontal-scale controls account for object/group transforms (#1034),
including exact sizes across grouped labels and resetting horizontal stretch while keeping editable text.
- **Missing:** Shape Builder misses planar regions and targets whole shapes (#937, #893); Transform effect dialog's invisible checkboxes and missing options (#885);
- **Missing:** Shape Builder misses planar regions and targets whole shapes (#937); Transform effect dialog's invisible checkboxes and missing options (#885);
PDF text boxes moving on open (#722); SVG units reverting to points (#864); bezier drag preview freezing (#834).
- **Impact:** wrong output in everyday work.
- **Estimate:** 8–15 h.
@@ -203,6 +203,7 @@ from G14 and the budget run of G15: **~170–270 h** one agent, ~50–80 h wall
| Date | Change | Summary |
|---|---|---|
| 2026-10-11 | minor | G11: #893 fixed (merged regions of crossing lines left seams); #937 still open, estimate unchanged |
| 2026-10-11 | minor | #1034: corrected scaled type controls; optional group font-size preservation remains separate. Estimates unchanged at this rounding. |
| 2026-10-11 | minor | G9: legacy `.ai` without the prolog opens with its layers (#1027) |
| 2026-10-11 | minor | G9: `.ai` pattern fills and global colours read from the editing data (#1025) |