* M4: Backspace or Delete at a list item's start keeps its indentation level
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
* Lists: the level is kept by Backspace and Delete alone, and the tests read the text's own glyph
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
---------
Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>
Co-authored-by: Brandon Thomas <echelon@gmail.com>
These scripts write no spaces between words, so a paragraph was one word
that only broke where it overflowed, mid-word (พัฒนาซอ|ฟต์แวร์).
breaks::word_breaks finds the word starts inside each run of them with
ICU4X's line segmenter (icu_segmenter 2.3, matching the icu_* crates in
the lock), and break_lines may break there when the next glyph starts a
new cluster. Where a run meets other text the UAX #14 subset decides as
before; a word wider than its box keeps #1400's emergency break.
Desktop uses the segmenter's dictionaries; the browser uses its LSTM
models (about 0.39 MB of wasm instead of 1.86 MB, which the 24 MiB web
gate can't take). ICU4X breaks between stray marks are filtered through
safe_emergency_break, so junk input never splits a cluster.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LvG6DyK6i9Nvvsp3tp77UP
The backward search for a safe break started at line_start + 2, so in a
three-letter run like กเม it skipped the only safe boundary and left the
line ending in a leading vowel.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Thai, Lao, Khmer and Burmese write no spaces, so a paragraph has no break
opportunity and wraps where it overflows. That emergency break could start a
line with a letter's trailing mark or end one with a leading vowel, splitting
a syllable (and, when the break fell between the glyphs of one cluster, drawing
it twice).
- The break backs up to a boundary that keeps a mark with its letter and a
leading vowel with the consonant after it; when the line's first character is
in one, it carries the pair over to the next line instead. Lao leading vowels
count too.
- It only breaks between grapheme clusters now, never between glyphs of one.
- Tests: a font-free unit test for the boundary rule, and a Thai wrapping test
over 39 widths (skips without a Thai face).
Co-Authored-By: DeepSeek V4.1 Flash (opencode) <noreply@opencode.ai>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
- The last line shown runs on into the word wrapped after it, so the ellipsis
fills the line ("Lorem consec…") instead of following the last whole word.
- An explicit height (node.set, transform.resize, a resize handle, fixed
sizing) on truncating text keeps it truncating (TextData::fix_size).
- Max lines on auto-height text hugs up to that many lines and ends in an
ellipsis; text.maxLines keeps auto height, Type settings show it as
truncating, .fig export writes textTruncation and import keeps auto height.
- node.get reports maxLines; text.fit measures every line.
Co-authored-by: Cursor <cursoragent@cursor.com>
Review: the test chose its Thai face, and checked each glyph's face, by
U+0E01, which the sample doesn't contain. It now asks for a face that has
every Thai character of the sample, and checks that each glyph's face has
the characters of its cluster.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Thai typed into a layer whose font has no Thai glyphs (Inter, which new
text starts in) was drawn as missing-glyph boxes, on the desktop and on
the web, even with a Thai face embedded or installed: FALLBACK_FAMILIES
listed Latin, CJK, Hangul, Arabic and symbol families but no Thai one.
Noto Sans Thai, Noto Sans Thai UI, Leelawadee UI, Thonburi and Tahoma go
after Noto Sans Arabic; they are only consulted for characters the
layer's own font lacks. Tests: the list has a Thai face for each
platform, and with one installed or embedded every Thai cluster in a
Latin layer, marks included, is drawn from it (skips without one).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signs such as U+2316 and U+2912 are in no text face. The fallback list
had the macOS and Windows symbol fonts (Apple Symbols, Segoe UI Symbol)
but nothing a Linux install has, so they drew as empty boxes there even
with Noto Sans Symbols 2 or Noto Sans Math installed. Adds Noto Sans
Symbols, Noto Sans Symbols 2 (and the Symbols2 spelling some packages
use) and Noto Sans Math after them.
JIS X 4051's line-start (行頭禁則) and line-end (行末禁則) sets were mostly
there — closing punctuation and brackets, small kana, the prolonged sound
mark, iteration marks and opening brackets already never start or end a line —
but a few categories fell through:
- the halfwidth small kana ｧ–ｯ (U+FF67..U+FF6F) and the halfwidth voicing
marks ﾞﾟ (U+FF9E/U+FF9F) were not line-start prohibited, so a wrapped line
could begin with them;
- the spacing (semi-)voiced sound marks ゛゜ (U+309B/U+309C) and the kana
iteration marks 〱〲〳〴〵 (U+3031..U+3035) likewise;
- the halfwidth parentheses ｟｠ were missing from the line-end/line-start
sets.
Add them (ranges in `class`, the two parentheses in the OPEN and CLOSE
strings), and pin every JIS category in the behaviour suite: the existing 22
cases stay and 9 join them (halfwidth small kana and small tsu, halfwidth and
spacing voicing marks, kana and vertical kana iteration marks, both halfwidth
parentheses), plus a wrap case where a halfwidth small kana moves down with
its base (キｬ) and a case showing a manual newline may still start a line with
a prohibited character (禁則 is for automatic wrapping only).
`break_opportunities` fails on the old sets at the first new halfwidth
small-kana case.
Latin wrapping, ideograph breaks and the rest of the behaviour suite are
unchanged, and the headline numbers stay as they are.
Verified: cargo test -p figcraft-text --lib 92 passed; cargo clippy
-p figcraft-text --all-targets -- -D warnings clean; rustfmt clean on the
touched files.
Docs: docs/target-app-parity.md text behaviour row and ROADMAP progress log,
revision history and header.
Text in the default Inter (or any Latin font) drew the missing-glyph box for every Hangul
syllable on macOS and Windows: no Korean family was on the fallback list, so the Korean
fonts those systems ship were never tried, and there is no default-font setting to work
around it. Apple SD Gothic Neo (macOS), Malgun Gothic (Windows) and Noto Sans CJK KR /
Noto Sans KR (Linux) now come after the Chinese and Japanese entries, so Han characters
resolve as before.
Fallback faces also follow the run's style: each fallback family gives its face nearest the
run's style instead of always its Regular, so Hangul (or kana) in a bold run comes out bold.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015MAPjgJo17KasfbzMTbV65
Measured against documents re-saved by other software. A line's height is rounded to whole
pixels (halves up) with the baseline keeping its fraction inside it; a glyph's advance and its
kerning are each rounded to 1/1024 em before scaling; a line's width and wrapping leave out the
letter spacing after its last visible glyph. Rule tests on built-in fonts, a local-only check over
such documents, and three behaviour expectations updated to the new rules.
## What
**A text behaviour suite written from the public documentation, and fixes for every divergence it found.** Each documented rule (Auto / % / px line height and how the leading is split, letter spacing in % and px, paragraph spacing and indent, auto width / auto height / fixed / truncate with max lines, vertical trim, decorations from the font's metrics) is a table-driven case with the numbers the rule implies and a one-line derivation, read from the face actually used so it holds on any machine with a font. CJK line breaking follows UAX #14 and the CJK line-start / line-end rules; caret steps follow UAX #29 grapheme clusters. Where the documentation is silent the case says so and pins today's behaviour.
**Fixes (6 of the 13 text cases fail on the old layout; the break and caret rules are new functions)**
- **CJK line breaking**: lines break between ideographs, kana and Hangul and before or after a Latin word next to them (before: no break before an ideograph that follows Latin, none after `。`, full-width forms, CJK punctuation or Extension B ideographs), never inside a Latin word, with kinsoku: closing brackets and quotes, `、。，．！？`, small kana, the prolonged sound mark and iteration marks never start a line (the character before moves down with them), opening brackets never end one. The ideographic space hangs at the line's end like a space. One small break-class table in `crates/text/src/breaks.rs`, no new crate.
- **Fallback fonts no longer move the baseline**: a style's ascent, descent, line height and cap height come from its own font, not the fallback face that drew some of its characters, so a line with CJK or emoji keeps the height and baseline of a Latin line (with a fixed line height the mixed line's baseline used to shift by the CJK face's taller metrics; with Auto the line grew). Decorations likewise use the style's font and size, so an underline runs at one height and weight through mixed scripts (and isn't thinned by synthesised small caps).
- **Paragraph indent applies to left-aligned text only** (documented); right-to-left paragraphs keep it when right-aligned (their start). The Type settings field is disabled with a hint otherwise.
- **Carets by grapheme cluster**: Left / Right, Delete and Backspace step over a whole emoji ZWJ sequence, flag, skin-tone sequence or letter with combining marks (they moved one code point at a time, leaving the caret inside an emoji and deleting half of it). A cluster is also shaped with one font, so a joiner or variation selector no longer splits an emoji sequence across faces.
- **Words by script**: double-click and word moves (Alt on macOS, Ctrl on Windows and Linux) take one script's run in text without spaces (`日本語` | `の` | `テキスト`), Hangul words end at spaces, and a Latin word keeps its combining marks (before: a whole CJK sentence was one word, and `cafe` + combining acute split at the accent).
**Missing documented setting, added**
- **Vertical trim** (cap height to baseline): `leadingTrim: none | capHeight` (`CAP_HEIGHT` from REST JSON) through `node.set`, a Standard / cap-height segmented control in Type settings, `inspect_document` and Dev Mode properties, CSS `text-box: trim-both cap alphabetic` in generated code. The box runs from the first line's cap height to the last baseline (auto height shrinks, auto layout parents follow); truncation counts the trimmed bottom; exports reach past the box so descenders below the last baseline aren't clipped. Canvas, PNG, SVG and PDF all draw from the same layout.
New strings go through `tr(...)` with `en.toml` / `es.toml` entries; the new segmented control reuses the Type settings one (accessible toggle names). Each edit is one undo step. `unicode-segmentation` (already in `Cargo.lock` through egui and winit) became a direct dependency of `figcraft-text`.
## Verified
- **Desktop app** over the control channel (own target dir, separate `APPDATA`, stopped by PID): a 200 px auto-height box of Japanese wraps with no line starting with `、。」` and `「` never ending a line (`…テスト` / `を折り返す、テスト` / `です。「括弧」は行` / `末に来ません。漢` / `字とかなとカタカ` / `ナ。`, the last `ナ` carried down with `。`); a Latin / CJK / Latin paragraph at 36 px line height is 108 px with evenly spaced baselines; the same text with vertical trim is 89.45 px (cap height 17.45 + 2 × 36), its box running from the cap height to the last baseline, and the Type settings control turns it off (108 px) and undo brings it back in one step; one Right arrow from after `a` in `a👨👩👧b` lands after the whole family emoji and Shift+Right then selects `b`; a double click selects the katakana run テキスト.
- **MCP**: `figcraft-cli mcp` (headless) built the same three texts; `inspect_document` reports 108 px for the 36 px paragraph and 89.42 px with `leadingTrim: capHeight` for the trimmed one (cap height of the headless font), the PNG export wraps the Japanese by the same rules and keeps the trimmed text's descenders, and `inspect.code` emits `text-box: trim-both cap alphabetic`.
- **Web**: `cargo xtask wasm` passes (part of the gate).
- **Performance**: text layout of a 2,250-char Latin and a 2,000-char Japanese paragraph wrapped at 300 px (release, median of 7 × 30 runs) before and after on the same machine: Latin 0.70 → 0.42–0.50 ms, Japanese 0.46 → 0.37–0.47 ms (within noise or faster: line metrics are now computed once per style change instead of per glyph). All-ASCII text skips grapheme segmentation.
- `cargo +1.99.0 xtask ci` passes (fmt, clippy, tests, layers, assets, wasm), after merging #131 and #132.
## Tests
- `text` (`behaviour_tests`, 13 tests): line height Auto / % / px; leading split above and below every line (positive and negative); letter spacing % / px / negative; paragraph spacing and indent by alignment; resizing and truncation with max lines; vertical trim (heights, first baseline, glyph spacing kept, truncation); decorations from the font's metrics through mixed scripts; fallback fonts keep line height and baseline (Auto, px, %); 22 break-opportunity cases; CJK wrapping with kinsoku, Latin words in CJK and Korean; the ideographic space hanging; grapheme steps over ZWJ families, flags, combining marks, skin tones and emoji presentation; one face per cluster. Font-dependent cases skip on a machine without fonts.
- `engine` (`text_behaviour_tests`, 5): arrows, Shift+arrows, Delete and Backspace by cluster; double-click and word moves by script (and through `keymap::text_motion` for Ctrl and Alt); IME composition with CJK wrapping and growing the box before commit; vertical trim through `node.set` (box size, PNG ink at the top, export bounds below the box, SVG and PDF, CSS, inspect, undo, junk refused, REST spelling); paragraph indent only on left-aligned text.
- `format` REST import test covers `leadingTrim: CAP_HEIGHT`.
## Not in this PR
- Documented but not modelled yet: list spacing, hanging quotes and hanging lists, underline style / thickness / offset / skip ink.
- Documentation silent, behaviour pinned: Korean wraps by syllable (no word mode); Han compounds next to each other are one word (no dictionary segmentation); letter spacing is added after the last character too; a fallback font's taller glyphs may overflow the line rather than grow it.
- `.fig` import doesn't read vertical trim yet (the field wasn't checked against real files).
- Spell check (on hold, #113).
- Progress docs: target-app-parity area 10 85%/64% → 87%/68%, 7–13 h → 5–10 h with the suite listed under text editing depth; feature breadth and ready for real work unchanged at this rounding; full parity ~323–621 h → ~321–618 h (target-app-parity, ROADMAP); ui-parity text row.
