G1: Fix intermediate overflow in adjoining width adjustments

Co-authored-by: Codex <noreply@openai.com>

docs/ui-parity.md

@@ -1,6 +1,6 @@
 # UI and interaction parity
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-14 · **Change:** minor (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:** 2026-10-14 · **Change:** minor (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)
 
 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,
@@ -151,7 +151,7 @@ tools, never checked side by side) isn't captured row by row.
 | Cmd/Ctrl: last-used selection tool; Cmd+Alt: Group Selection inside Direct Selection | partial | |
 | Eyedropper reads visible sources while their layer/object is locked or outside isolation | done | Ordinary/Shift/Shift+Alt and gradient-stop reads preserve the source and selection; Alt reverse remains editable-only; hidden art stays excluded (`eyedropper_sources.rs`, #1251) |
 | Add a visible stroke after drawing with inherited None/zero-width paint | done | Paint and Swap Fill/Stroke restore the existing 1 pt default; positive widths and painted zero widths stay as set; Undo/Redo and targeted appearance items tested (`stroke_visibility.rs`, #1253) |
-| Double-click a stroked segment to create a width point in Width Point Edit | done | Command and pointer regressions cover opening, sampled widths, adjoining adjustment on/off through checkbox/OK, compound paths, Cancel/Delete and Undo/Redo; dialog layout reviewed. [Validation evidence](target-app-parity.md#evidence-what-ships-today-by-area) |
+| Double-click a stroked segment to create a width point in Width Point Edit | done | Finite-arithmetic follow-up: engine regressions and full CI passed; [Validation evidence](target-app-parity.md#evidence-what-ships-today-by-area). Command and pointer regressions cover opening, sampled widths, adjoining adjustment on/off through checkbox/OK, compound paths, Cancel/Delete and Undo/Redo; dialog layout reviewed. [Validation evidence](target-app-parity.md#evidence-what-ships-today-by-area) |
 | Shift-double-click a width point enables adjoining adjustment in Width Point Edit | done | Tool dispatch, plain double-click control, neighboring widths, Undo/Redo and Cancel in `dialogs/width_point.rs` |
 | Alt-drag duplicates (objects, artboards with their art) | done | |
 | Document Setup → Edit Artboards applies valid settings, closes the dialog and activates the Artboard tool | done | Pointer-click tests cover successful handoff, invalid settings, OK, Cancel and Undo in `dialogs/document_setup.rs`. |
@@ -226,6 +226,7 @@ re-measure of the panels added since. Slider rails show on Medium Dark (#1808, #
 |---|---|---|
 | 2026-10-14 | minor | Quick Image Trace presets reveal the adjustment panel with Advanced open; Properties reopens it. Sliders keep their preset row until release so the re-trace is committed. UI regressions added; scores and remaining estimates unchanged. |
 | 2026-10-14 | minor | The macOS save sheet's Format menu goes back to missing: #1855 withdrew it to restore saving (#866 reopened). Rows added for the X/Y/W/H of direct-selected anchors (#1839, fixes #1824), the toolbar and All Tools drawer (#1751) and the Actions panel selection (#1853, part of #1629); the snapping row notes Snap to Grid over Snap to Pixel (#1840). Scores unchanged (estimated) |
+| 2026-10-14 | minor | Width-point finite-arithmetic follow-up: atomicity, history and native round-trip regressions and current full CI passed; scores and hours unchanged. |
 | 2026-10-14 | minor | Align and Distribute act on the anchor points selected with Direct Selection: the points of one path align to each other, not to the artboard, and Distribute spaces them (#1641, fixes #1636; aligning to a key anchor is still missing); Delete removes every selected anchor of a closed path (it used to remove the wrong ones), removes objects selected whole along with the selected anchors of others, and keeps the remainder selected so a second Delete removes it (#1674); In isolation mode Direct Selection and Group Selection pick only inside the isolated object (#1666); Escape cancels a Direct Selection drag (#1803, #1743); Escape while typing ends the edit, keeps the type selected and switches to the Selection tool (#1802, #1686, #1656); A filled Pencil path keeps a stroke of None (#1804, part of #1679); With the Pen, a press that moves under 3 screen pixels is a click (a corner without handles), and a Precise Cursors command toggles the existing preference and can take a shortcut (#1663); The [ and ] keys reach the Blob Brush, the Eraser and the Symbolism tools in the app (#1734, part of #1661); In the Pathfinder panel a group selected alone counts its nested shapes, so an expanded stroked object keeps the Shape Modes enabled (#1642, #1635); Object › Expand turns radial, grid and mirror repeats into groups of their instances (#1765, #1756); Select › Same matches type on its characters' fill and stroke (#1746, #1737); Fields commit what was typed when you click away or move to another field, as Enter does; Escape still discards it (#1787); Up and Down move through the command search results and Enter runs the highlighted one (#1798, #1757); Slider rails show on Medium Dark (#1808, #1662); On Windows the custom title bar's window stays truly borderless, so the pointer lines up with what is drawn on systems where the hidden caption offset it (#1791, #1758; awaiting the reporter's confirmation); Tool cursors are painted into the window on Wayland (#1652; not run on Linux, #1645 stays open until confirmed); the guide-position row (#1659) is now "not scored": the documentation found doesn't establish it, and it is kept as a convenience pending the owner's decision; scores unchanged |
 | 2026-10-13 | minor | Pathfinder's Trim, Merge and Crop remove the objects' strokes, and Merge joins same-fill objects whatever their strokes were, as the public Pathfinder page describes (#1572, fixes #1570); Offset Path with an inset larger than the shapes says the offset leaves nothing, instead of asking to select paths (#1591, fixes #1590); The Symbols panel's New Symbol opens Symbol Options to name the symbol first, and Alt-click skips it (#1566, fixes #1560); Tool flyouts are as wide as their longest translated name and shortcut need, so names no longer run into shortcuts in Spanish and other languages (#1650, fixes #1616); Smart Guides: a point drawn with the Pen or a shape tool, and an anchor dragged with Direct Selection, snaps to where paths and ruler guides cross, labelled "intersect" (#1658, part of #1602; a moved selection's own anchors don't); The Transform panel shows a selected ruler guide's X or Y, and typing a value moves it (#1659, part of #1597). This is not established by the documentation we could find: the public help pages on guides, rulers and the Transform, Control and Properties panels (read again on 2026-10-14) describe selecting and dragging unlocked guides and the panels' X and Y for a selection, not a guide's position in a panel, and the one public statement of it is a user's [community answer](https://community.adobe.com/questions-652/adding-a-new-custom-guide-785586), which is not documentation. It is kept as a convenience pending the owner's decision, with no parity claim and nothing counted towards a score; Select Behind (Ctrl/Cmd-click) tests each object once, so a deep stack of overlapping objects no longer slows it; same objects in the same order (#1571); Commands that take `ids` run on the objects given with nothing selected, over MCP, the control channel and the CLI too (#1577, fixes #1575); scores unchanged (estimated) |
 | 2026-10-13 | minor | G1/M11: Artboard panel deletion, protected deletion keys and navigator/tool synchronization before and after deletion; history normalization preserves valid multiselection; history regressions and full workspace CI pass; scores and hours unchanged |