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fix: improved dynamic ligature probing to handle contextual alternates

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This commit is contained in:
Adam Kowalski 2026-01-16 21:35:53 -08:00 • committed by Jeremy Soller
parent c6ce5e69e5
commit 723841f934
2 changed files with 29 additions and 9 deletions
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14
tests/shaping_and_rendering.rs
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@ -94,12 +94,12 @@ fn test_ligature_segmentation() {
let shape = line.shape_opt().expect("ShapeLine not found");
let span = &shape.spans[0];
// Inter-Regular does NOT have a ligature for |>, so we expect it to be split.
// This confirms that we didn't break valid wrapping for non-ligatures.
// Inter-Regular HAS a contextual alternate for |> (changing the glyph ID),
// so our probe detects it and keeps them together.
assert_eq!(
span.words.len(),
2,
"Expected '|>' to be 2 words (no ligature in Inter), but found {} words.",
1,
"Expected '|>' to be 1 word (contextual alternate in Inter), but found {} words.",
span.words.len()
);
@ -121,11 +121,11 @@ fn test_ligature_segmentation() {
buffer.shape_until_scroll(false);
let line = &buffer.lines[0];
let shape = line.shape_opt().expect("ShapeLine not found");
// Inter-Regular does not have a != ligature.
// Inter has a contextual alternate for != too.
assert_eq!(
shape.spans[0].words.len(),
2,
"Expected '!=' to be 2 words (no ligature), but found {} words.",
1,
"Expected '!=' to be 1 word (contextual alternate), but found {} words.",
shape.spans[0].words.len()
);