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fix(mtext): support arabic cursive shaping and bidirectional rtl text layout

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- Enable fallback font metrics for HarfBuzz shaping in TTF glyph resolver

- Implement Unicode Bidirectional Algorithm (UBA) paragraph base direction detection

- Anchor right-to-left paragraphs to right container boundaries by default

- Reorder line atoms with base direction level to preserve neutral punctuation attachment

- Right-align RTL single-line TEXT and handle editor caret placement on RTL glyphs
This commit is contained in:
Karim Jerbi committed 2026-09-12 11:06:11 +01:00
1 parent ef189d7781
commit f1d5284fb9
8 files changed
+577 -73
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src/app/mtext_editor.rs
+3 -3
View File
@@ -640,16 +640,16 @@ fn vertical_caret_target(
let anchor = boxes
.iter()
.find(|item| item.vis == caret)
.map(|item| (item.xmin, item.ymin, item.ymax))
.map(|item| ((if item.is_rtl { item.xmax } else { item.xmin }), item.ymin, item.ymax))
.or_else(|| {
caret.checked_sub(1).and_then(|previous| {
boxes
.iter()
.find(|item| item.vis == previous)
.map(|item| (item.xmax, item.ymin, item.ymax))
.map(|item| ((if item.is_rtl { item.xmin } else { item.xmax }), item.ymin, item.ymax))
})
})
.or_else(|| boxes.first().map(|item| (item.xmin, item.ymin, item.ymax)));
.or_else(|| boxes.first().map(|item| ((if item.is_rtl { item.xmax } else { item.xmin }), item.ymin, item.ymax)));
let Some((anchor_x, anchor_y, anchor_top)) = anchor else {
return caret.min(visible_count);
};