Type: Noto Sans Thai from craft-fonts is the Thai fallback, on the web too

The web build has no installed fonts, so Thai there showed as empty
boxes. With a craft-fonts checkout that has Noto Sans Thai, its Thai
font joins the document font database after the Arabic ones (the
fallback for Thai where no Thai font is installed) and the web build
fetches it before the app starts, as it does Noto Sans Arabic.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

ROADMAP.md

@@ -127,7 +127,7 @@ Ranked; detail in [docs/roadmap.md](docs/roadmap.md) and [docs/gaps.md](docs/gap
 
 | Date | What landed |
 |---|---|
-| 2026-10-11 | Effect › Brush Strokes: Accented Edges, Angled Strokes, Crosshatch, Dark Strokes, Ink Outlines, Spatter, Sprayed Strokes, Sumi-e (G2). Command parameters from agents and files checked before anything changes (paint, place, cuts, dashes, crop, asset ids, anchors, paths, distort; #984–#999); command dialogs keep whole numbers whole, so Create Object Mosaic takes the tiles typed (#1000); stepper arrows take Shift (×10) and Ctrl/Cmd (÷10) like the arrow keys (#991). Exports and Rasterize supersample Art Optimized edges, so shapes meeting edge to edge leave no seam (#983). Character and paragraph styles take leading, kerning, mojikumi and the other attributes left out at their defaults (#1001). Drawing, typing and pasting with no layer shown and unlocked is refused instead of adding art to a hidden or locked layer (#1002). MCP `add_text` gives type on or in a path the colour asked for (#1003). MCP `screenshot` of a connected app renders the artboard asked for (#1004). `vectorcraft-cli run` ends quietly when its reader closes early (#1005). Select › All on Active Artboard selects on the artboard made active, not always the first (#1006). Reverse Gradient keeps off-centre midpoints, mirrored (#1007). A polar grid with no radial dividers draws none (#1008). Use Precise Cursors also covers the Pen's join pointer (#1009). SVGs with one absolute and one unitless root side import at their size, unstretched (#1010). DXF US survey inches, yards and miles open at their size and name (#1011). A file placed into a document with no other links follows its first change even while the app sits idle (#1031). PDF import keeps the style a font name says when the file doesn't embed the font (#1023). Shift selects ruler guides and art together, and Delete removes both (#1022). Open filled paths are hit by their fill on every side, the rotate cursor bows around the corner it is at, the flip icons match their flips, the Color Picker previews on the selection, and Properties › Transform reaches Scale Corners and Scale Strokes & Effects (#1036). Offset Path and the other booleans finish on outlines where the sweep used to loop until memory ran out (linesweeper 0.5, #1028). Floating panel groups stack into sets that move together, collapse to their tabs and dock as extra dock columns that scroll (#1020). Ruler guides live on layers: listed in the Layers panel, shown, hidden, locked, duplicated, merged and deleted with their layer, and moved between layers (#1021). A `.ai` whose editing data uses global process colours (`Xk`/`XK`) or pattern fills keeps its sublayers: the colours come in as global swatches at their tint, the patterns as pattern swatches (#1025). A `.ai` in PostScript form opens through its layers, read from the program itself, also when it names the prolog defining its operators without including it, as Rhino and other CAD apps write it (#1027). A fill or stroke chosen while the Type tool has characters selected colours just those characters (#1063). Scaled type shows its scaled font size, leading, baseline shift and horizontal scale in the Character panel, and a size typed there is the size you get (#1034). Character panel menu › Proportional Metrics sets Japanese and Chinese full-width glyphs on the font's proportional widths in horizontal type (#966). Align, Distribute, Move, Arrange, Lock, Hide, Ungroup and other Object commands that would change nothing no longer record an undo step or mark the document changed (#1060). Spot colours defined in Lab open with their Lab values from `.ai` and PDF files, instead of as wrong RGB colours or their CMYK equivalents (#1032). Build scripts leave a generated source they wouldn't change untouched, so the next build doesn't compile most of the workspace again where file times lose their sub-second part (#1051). A fill colour recolours the gradient mesh point last clicked with the Mesh tool or Direct Selection, and a Mesh tool click on a mesh's point selects that mesh (#1052). The All Tools drawer stays two tools wide instead of filling a wide window (#1054). Text Wrap's Make, Release and Options refuse a list of object ids with a malformed or unknown id instead of skipping it (#1055). A freeform gradient line with a malformed point index is refused instead of being shortened to the indices that are valid (#1056). The Corners dialog (`ui.corners`) refuses a malformed object id or a listed anchor that isn't a corner instead of editing the selection or the other corners (#1057). New View refuses a centre that isn't exactly [x, y] and a rotation that isn't a number, instead of trimming the one and saving the other as 0° (#1058). The command sweeps try junk scale, spacing and artboard values too, which they had skipped since before those bugs were fixed (#1059). EPS and PostScript `arc` and `arcn` with huge angles no longer hang the import, and an arc whose angles are whole turns apart is empty, as the PostScript reference defines it (#1062). Align and DisLine truncated
+| 2026-10-11 | Effect › Brush Strokes: Accented Edges, Angled Strokes, Crosshatch, Dark Strokes, Ink Outlines, Spatter, Sprayed Strokes, Sumi-e (G2). Command parameters from agents and files checked before anything changes (paint, place, cuts, dashes, crop, asset ids, anchors, paths, distort; #984–#999); command dialogs keep whole numbers whole, so Create Object Mosaic takes the tiles typed (#1000); stepper arrows take Shift (×10) and Ctrl/Cmd (÷10) like the arrow keys (#991). Exports and Rasterize supersample Art Optimized edges, so shapes meeting edge to edge leave no seam (#983). Character and paragraph styles take leading, kerning, mojikumi and the other attributes left out at their defaults (#1001). Drawing, typing and pasting with no layer shown and unlocked is refused instead of adding art to a hidden or locked layer (#1002). MCP `add_text` gives type on or in a path the colour asked for (#1003). MCP `screenshot` of a connected app renders the artboard asked for (#1004). `vectorcraft-cli run` ends quietly when its reader closes early (#1005). Select › All on Active Artboard selects on the artboard made active, not always the first (#1006). Reverse Gradient keeps off-centre midpoints, mirrored (#1007). A polar grid with no radial dividers draws none (#1008). Use Precise Cursors also covers the Pen's join pointer (#1009). SVGs with one absolute and one unitless root side import at their size, unstretched (#1010). DXF US survey inches, yards and miles open at their size and name (#1011). A file placed into a document with no other links follows its first change even while the app sits idle (#1031). PDF import keeps the style a font name says when the file doesn't embed the font (#1023). Shift selects ruler guides and art together, and Delete removes both (#1022). Open filled paths are hit by their fill on every side, the rotate cursor bows around the corner it is at, the flip icons match their flips, the Color Picker previews on the selection, and Properties › Transform reaches Scale Corners and Scale Strokes & Effects (#1036). Offset Path and the other booleans finish on outlines where the sweep used to loop until memory ran out (linesweeper 0.5, #1028). Floating panel groups stack into sets that move together, collapse to their tabs and dock as extra dock columns that scroll (#1020). Ruler guides live on layers: listed in the Layers panel, shown, hidden, locked, duplicated, merged and deleted with their layer, and moved between layers (#1021). A `.ai` whose editing data uses global process colours (`Xk`/`XK`) or pattern fills keeps its sublayers: the colours come in as global swatches at their tint, the patterns as pattern swatches (#1025). A `.ai` in PostScript form opens through its layers, read from the program itself, also when it names the prolog defining its operators without including it, as Rhino and other CAD apps write it (#1027). A fill or stroke chosen while the Type tool has characters selected colours just those characters (#1063). Scaled type shows its scaled font size, leading, baseline shift and horizontal scale in the Character panel, and a size typed there is the size you get (#1034). Character panel menu › Proportional Metrics sets Japanese and Chinese full-width glyphs on the font's proportional widths in horizontal type (#966). Align, Distribute, Move, Arrange, Lock, Hide, Ungroup and other Object commands that would change nothing no longer record an undo step or mark the document changed (#1060). Spot colours defined in Lab open with their Lab values from `.ai` and PDF files, instead of as wrong RGB colours or their CMYK equivalents (#1032). Build scripts leave a generated source they wouldn't change untouched, so the next build doesn't compile most of the workspace again where file times lose their sub-second part (#1051). A fill colour recolours the gradient mesh point last clicked with the Mesh tool or Direct Selection, and a Mesh tool click on a mesh's point selects that mesh (#1052). The All Tools drawer stays two tools wide instead of filling a wide window (#1054). Text Wrap's Make, Release and Options refuse a list of object ids with a malformed or unknown id instead of skipping it (#1055). A freeform gradient line with a malformed point index is refused instead of being shortened to the indices that are valid (#1056). The Corners dialog (`ui.corners`) refuses a malformed object id or a listed anchor that isn't a corner instead of editing the selection or the other corners (#1057). New View refuses a centre that isn't exactly [x, y] and a rotation that isn't a number, instead of trimming the one and saving the other as 0° (#1058). The command sweeps try junk scale, spacing and artboard values too, which they had skipped since before those bugs were fixed (#1059). EPS and PostScript `arc` and `arcn` with huge angles no longer hang the import, and an arc whose angles are whole turns apart is empty, as the PostScript reference defines it (#1062). Align and DisLine truncated
 | 2026-10-10 | Initial live Revolve (Effect › 3D and Materials, #846, #605), in its own `three-d` crate. Progress docs re-measured and restructured to the craftrules standard (this page, `docs/target-app-parity.md`, `gaps.md`, `ui-parity.md`, the format, hardware, localization, effects and type checklists). Same day: v0.8.0; Effect › Distort, Pixelate and Texture filters (13); German interface; Variables (data merge); Graph Type value axes and tick marks; restart when the first frame never reaches the screen (#964) |
 | 2026-10-09 | Radial Blur, Smart Blur, Unsharp Mask (gap 2 begins); 340 commits, the busiest day |
 | 2026-10-08 | v0.5.0–v0.7.0; community contributions: Pen and shape-tool modifiers, Layers, Artboards, Japanese composition, Hebrew/Arabic type, interface languages, saved selections |

crates/text/src/craft_fonts.rs

@@ -1,8 +1,8 @@
 //! Fonts from the optional craft-fonts build input (<https://github.com/storytold/craft-fonts>).
 //!
 //! Built with `CRAFT_FONTS_DIR=<craft-fonts checkout>`, [`CRAFT_FONTS`] holds every font in its
-//! manifest (Japanese UI and document fonts, and Arabic fonts); built without it, it is empty and Japanese
-//! text falls back to the installed system fonts. Release builds always set it. See `build.rs`
+//! manifest (Japanese UI and document fonts, Arabic fonts and Noto Sans Thai); built without it,
+//! it is empty and that text falls back to the installed system fonts. Release builds always set it. See `build.rs`
 //! and craftrules `standards/fonts.md`.
 
 /// A font from the optional craft-fonts build input (empty unless built with `CRAFT_FONTS_DIR`).
@@ -39,6 +39,10 @@ impl CraftFont {
     pub fn is_arabic(&self) -> bool {
         self.scripts.contains(&"Arab")
     }
+    /// Is the font for Thai text?
+    pub fn is_thai(&self) -> bool {
+        self.scripts.contains(&"Thai")
+    }
     /// A serif (Mincho) family, for document text.
     pub fn is_mincho(&self) -> bool {
         self.family.contains("Mincho")
@@ -63,11 +67,13 @@ pub fn japanese_document_fonts() -> Vec<&'static CraftFont> {
 
 /// The craft-fonts faces the document font database loads: the Japanese ones in
 /// [`japanese_document_fonts`] order, then the Arabic ones in manifest order (Noto Sans Arabic
-/// first: the fallback for Arabic text; the other families are picked by name). Empty when built
-/// without craft-fonts.
+/// first: the fallback for Arabic text; the other families are picked by name), then the Thai ones
+/// (Noto Sans Thai: the fallback for Thai text where no Thai font is installed, and on the web).
+/// Empty when built without craft-fonts.
 pub fn document_fonts() -> Vec<&'static CraftFont> {
     let mut v = japanese_document_fonts();
     v.extend(CRAFT_FONTS.iter().filter(|f| f.is_arabic() && !f.is_japanese()));
+    v.extend(CRAFT_FONTS.iter().filter(|f| f.is_thai() && !f.is_japanese() && !f.is_arabic()));
     v
 }
 
@@ -104,8 +110,10 @@ mod tests {
             assert!(name.ends_with(".ttf") || name.ends_with(".otf"), "{}", w.url);
             assert!(w.integrity.starts_with("sha256-") && w.integrity.len() == "sha256-".len() + 44, "{}", w.integrity);
         }
+        // The fallbacks the first frame may need: Noto Sans Arabic and Noto Sans Thai, where the
+        // checkout has them.
         let startup: Vec<_> = WEB_FONTS.iter().filter(|w| w.startup).map(|w| w.family).collect();
-        let noto = CRAFT_FONTS.iter().any(|f| f.family == "Noto Sans Arabic");
-        assert_eq!(startup, if noto { vec!["Noto Sans Arabic"] } else { vec![] });
+        let expected: Vec<_> = ["Noto Sans Arabic", "Noto Sans Thai"].into_iter().filter(|n| CRAFT_FONTS.iter().any(|f| f.family == *n)).collect();
+        assert_eq!(startup, expected);
     }
 }

crates/text/src/tests.rs

@@ -729,6 +729,20 @@ fn burasagari_leaves_latin_commas_and_full_stops_inside_the_line() {
     }
 }
 
+/// With craft-fonts and no installed fonts (the web), Thai is set in Noto Sans Thai, not as empty
+/// boxes. Skipped when built without craft-fonts or with a checkout that has no Thai font.
+#[test]
+fn thai_without_installed_fonts_takes_the_craft_fonts_thai_font() {
+    if !crate::CRAFT_FONTS.iter().any(|f| f.is_thai()) {
+        eprintln!("skipping: no Thai font in craft-fonts (set CRAFT_FONTS_DIR to a checkout that has one)");
+        return;
+    }
+    let l = layout(db(), &point("ภาษาไทย", style(20.0)));
+    assert!(!l.glyphs.is_empty() && l.glyphs.iter().all(|g| g.gid != 0), "no .notdef");
+    let families: Vec<String> = l.glyphs.iter().filter_map(|g| db().face_by_id(g.font_id)).map(|f| f.family.clone()).collect();
+    assert!(families.iter().all(|f| f == "Noto Sans Thai"), "{families:?}");
+}
+
 /// Thai is written without spaces between words: area type breaks its lines between words (as a
 /// model of Thai words finds them), never inside a word nor before a vowel or tone mark.
 #[test]

crates/text/web-fonts.txt

@@ -4,6 +4,7 @@
 #   background = fetched after the app starts (fonts users pick by name)
 # Read by build.rs (the WEB_FONTS table) and `cargo xtask web-fonts` (copies the files, a Trunk hook).
 startup | Noto Sans Arabic | Regular
+startup | Noto Sans Thai | Regular
 background | Cairo | Regular
 background | Tajawal | ExtraLight
 background | Tajawal | Light

docs/development.md

@@ -133,6 +133,8 @@ CRAFT_FONTS_DIR="$PWD/../craft-fonts" cargo xtask ci   # also runs the Japanese-
   embed everywhere, was 8.7 MB, so the web build is still smaller than before.
 - Document text: the Japanese faces join the font database after the bundled fonts (Mincho first),
   so they are the fallback for Japanese after the requested font; installed system fonts come after.
+  Noto Sans Thai (when the checkout has it) is the fallback for Thai where no Thai font is
+  installed, and the web build fetches it before the app starts (`crates/text/web-fonts.txt`).
 - UI: `theme::install_fonts` adds them at the end of every egui family (BIZ UDPGothic first), after
   the UI fonts and before the installed fonts `ui_fonts.rs` discovers for other scripts.
 - Tests that need Japanese glyphs skip with a message when built without craft-fonts. The FreeBSD