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Fix text layout bugs in wrapped texts (#8137)

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Fixes some bugs that happen randomly when resizing horizontal_wrapped
texts:


https://github.com/user-attachments/assets/141392d2-0239-465a-ba7b-c864f7823319

Adds regression tests (I enjoy using claude to fix these bugs, first
have it create a minimal repro test case, then fix the bug by iterating
until it figures out a fix).
This commit is contained in:
Lucas Meurer
2026-05-04 13:45:50 +02:00
committed by GitHub
parent fe8b1edfc6
commit e9b8c0d918
3 changed files with 105 additions and 7 deletions
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7
crates/epaint/src/text/text_layout.rs
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@@ -726,18 +726,19 @@ fn line_break(
if job.wrap.max_rows <= out_rows.len() {
*elided = true; // can't fit another row
} else {
let paragraph_min_x = paragraph.glyphs[row_start_idx].pos.x - row_start_x;
let paragraph_max_x = paragraph.glyphs.last().unwrap().max_x() - row_start_x;
let glyphs: Vec<Glyph> = paragraph.glyphs[row_start_idx..]
.iter()
.copied()
.map(|mut glyph| {
glyph.pos.x -= row_start_x;
glyph.pos.x -= row_start_x + paragraph_min_x;
glyph
})
.collect();
let section_index_at_start = glyphs[0].section_index;
let paragraph_min_x = glyphs[0].pos.x;
let paragraph_max_x = glyphs.last().unwrap().max_x();
out_rows.push(PlacedRow {
pos: pos2(paragraph_min_x, 0.0),