Part of #394: Highlight Alternate Glyphs paints pink behind OpenType substitutions.

docs/gaps.md

@@ -193,8 +193,8 @@ 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
 
+- **Missing:** ~14 Preferences options stored but not acted on (#394: Open
 - **Done:** quick Image Trace presets reveal Threshold and Advanced controls (Paths, Corners, Noise); Properties can reopen them. Other context-specific Properties gaps remain.
-
 - **Missing:** ~15 Preferences options stored but not acted on (#394: Highlight Alternate Glyphs, Open
   Documents As Tabs, Real-time Drawing, hyphenation language, devices…), Properties panel per
   context, context menus beyond the canvas, Layers panel row menus and Collect for Export, SVG Interactivity.

docs/mcp.md

@@ -1974,9 +1974,11 @@ their own Anti-aliasing option),
 `scrubNumericFields` (on: a horizontal drag on a numeric field's label steps the field, one undo step per drag; the
 control channel's `ui.drag` scrubs), `showHomeScreen` (on by default: the Home screen while no document is open;
 off, an empty window, and the Home button or `app.home` still shows the screen), `autoCollapseIconPanels` (off by
-default: on, a click away from a panel popped out of the icon column puts it away) and `displayPrintSize` (off by
+default: on, a click away from a panel popped out of the icon column puts it away), `displayPrintSize` (off by
 default: View › Actual Size / `view.actualSize` is one document point per screen point; on, one document inch fills
-96 screen points, an inch at the system's reference density whatever the display scaling). `blackOnScreen`
+96 screen points, an inch at the system's reference density whatever the display scaling). `highlightAlternateGlyphs` (on by default: the canvas paints a pink cell behind glyphs OpenType features
+substituted — ligatures, contextual forms — on screen; Document Setup's Highlight Substituted Fonts / Glyphs stay
+separate). `blackOnScreen`
 (Appearance of Black › On Screen, `accurate` by default) sets how the canvas shows pure CMYK black, black ink alone
 at 100%: `accurate` shows it through the CMYK profile, a dark grey, and `rich` shows it as RGB black. Rich blacks,
 black tints and images show the same either way, and exports are unchanged. `blackOutput` (Appearance of Black ›

docs/type-parity.md

@@ -25,7 +25,7 @@ against Illustrator's public documentation; **estimated** unless noted.
 | Character and Paragraph panels, styles with overrides | done | Character-style Auto-leading resets, partial definitions, local leading overrides, override markers, Undo/Redo and native serialization have regression coverage; differing paragraph alignments leave the shared alignment buttons unselected (headless regressions, full integration CI and visual review pass); mixed-value display for other paragraph fields remains missing |
 | Character size and horizontal scale after object/group scaling | done | #1034: fields and setters compensate the stored affine; point size follows the transformed em-height axis, not the glyph ink bounds. Range edits, keyboard increments, leading and baseline shift use document points; rotation, reflection and shear remain editable. |
 | Preserve font sizes while scaling a group | missing | Separate enhancement; scaling still scales text with the other artwork. |
-| OpenType panel, Glyphs panel, alternates | done | Highlight Alternate Glyphs preference unused (#394); stylistic sets ss01–ss20, stylistic and titling alternates, proportional and lining figures, superscript and subscript are character-style features (`text.setStyle {features}`, #1607) |
+| OpenType panel, Glyphs panel, alternates | done | Highlight Alternate Glyphs preference (#394) paints pink behind OpenType substitutions on screen; stylistic sets ss01–ss20, stylistic and titling alternates, proportional and lining figures, superscript and subscript are character-style features (`text.setStyle {features}`, #1607) |
 | Font menu: samples, live preview, filters, favourites; font matching by any name; Find Font | done | #339; script filter: Japanese, Latin, Thai; the font scan on Linux also reads the folders fontconfig's configuration lists, such as TeX fonts under `/usr/share/texmf/fonts` (#1548, fixes #1529; not verified on Linux) |
 | Missing glyphs set in an installed font made for their script (Thai, Lao, Khmer, Myanmar first; then any font that has them) | done | Thai: Leelawadee UI, Tahoma, Thonburi, Sukhumvit Set, Noto Sans Thai, TLWG |
 | Full font-name matching (OpenType name ID 4) | done | #1258: loaded/cataloged faces and Missing Fonts searches; localized names and variable default faces; Windows font-service QA pending |