* Edit text: support per-font visual-order Indic text and nukta reordering
- Detect legacy visual-order Indic fonts via Metrics.visual_order (fonts with
Indic codepoints without OpenType GSUB tables, or legacy visual font names).
- Implement Indic visual-to-logical and logical-to-visual pre-base vowel
reordering in crates/edit/src/indic.rs, with support for decomposed/precomposed
nuktas and conjuncts.
- Apply reordering during extraction and source font reuse only when visual_order
is set, leaving modern logical-order text untouched.
- Add unit tests for nuktas, conjuncts, and round-trips in crates/edit/src/indic.rs
and font visual_order tests in crates/edit/src/tests.rs.
* Visual-order Indic: positive evidence only, ActualText kept logical, no font decoding
- A font is visual order only when it is a known legacy Indic family (subset tag
allowed; aps-/dv- as prefixes) with an Indic Unicode mapping. A missing GSUB is
no evidence (bare CFF and subset fonts drop it), so Metrics::from_dict no longer
decodes every embedded font program on every call.
- Lines with /ActualText text are already logical: skip indic::to_logical, so
"बढ़िया" no longer becomes "बढ़यिा".
- reading_lines no longer runs bidi recovery on every line (it changed RTL
reading_blocks output for all documents); only the Indic recovery remains.
- indic.rs indexes through get().
- Tests use a ToUnicode fixture (not visual-order ActualText), cover an edit
round-trip, logical ActualText in a legacy font, and a subset Noto font.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Co-authored-by: Brandon Thomas <echelon@gmail.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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