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Type: Thai falls back to a font made for Thai

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Thai typed in a font without Thai glyphs (Source Sans 3, a Latin font)
took the first loaded face that had them, or the first installed file
that did, in path order: on one Windows machine a display face (Kanit)
rather than Leelawadee UI. Characters of Thai, Lao, Khmer and Myanmar
now try fonts made for their script first, installed ones loaded on
demand (Leelawadee UI, Tahoma, Thonburi, Sukhumvit Set, Noto Sans Thai,
the TLWG fonts for Thai), then the fallback as before. Latin beside
them keeps the font chosen.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
bflatastic
2026-10-11 18:42:31 +07:00
co-authored by Claude Opus 5.5
parent 7c7a7dcdc9
commit fba3702103
4 changed files with 88 additions and 2 deletions
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docs/type-parity.md
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# Type parity
> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-11 · **Change:** minor (Proportional Metrics in vertical type, `vpal`, #966; document-point character controls after object/group scaling, #1034) · **Target:** Adobe Illustrator 2026 (30.x)
> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-11 · **Change:** minor (Thai typed in a font without Thai falls back to a font made for Thai; earlier: Proportional Metrics in vertical type, `vpal`, #966) · **Target:** Adobe Illustrator 2026 (30.x)
Type is Illustrator's largest single area by use (weight 13 of 105 across "Type core" and "Type advanced" in
[target-app-parity.md](target-app-parity.md)). This checklist lists the features one by one. Status is from the
@@ -27,6 +27,7 @@ against Illustrator's public documentation; **estimated** unless noted.
| 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) |
| Font menu: samples, live preview, filters, favourites; font matching by any name; Find Font | done | #339 |
| 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 |
| Variable fonts | partial | named instances as styles; axis sliders missing |
| Colour fonts (OpenType SVG / COLR) | partial | |
| Every-line and Single-line composers | done | tuned by eye, never compared side by side |
@@ -51,6 +52,7 @@ against Illustrator's public documentation; **estimated** unless noted.
| Date | Change | Summary |
|---|---|---|
| 2026-10-11 | minor | Thai (Lao, Khmer, Myanmar) missing from the font in use falls back to an installed font made for the script instead of whichever face covering it loaded first; score unchanged (estimated) |
| 2026-10-11 | minor | Proportional Metrics done: `palt` in horizontal type, `vpal` in vertical type (#966, #1082); ruby and manual tate-chu-yoko still missing |
| 2026-10-10 | minor | #1034: transformed character controls and regression coverage; preserving group font sizes remains a separate enhancement. Scores/hours unchanged at this rounding. |
| 2026-10-10 | major | First checklist, split out of the parity table's Type core and Type advanced rows |