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multi_buffer: Make anchor_in_excerpt fallible for bad text anchors (#40496)

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`MultiBuffer::anchor_in_excerpt` currently just wraps the given text
anchor in a multibuffer anchor. This allows one to get a multibuffer
anchor that points outside its excerpt which is basically never what one
wants. This PR now does a bounds check and returns `None` if the given
text anchor is not within the bounds of the excerpt.

Release Notes:

- N/A *or* Added/Fixed/Improved ...

Co-authored-by: Kirill Bulatov <kirill@zed.dev>
This commit is contained in:
Lukas Wirth
2025-10-17 15:40:37 +00:00
committed by GitHub
co-authored by Kirill Bulatov
parent 7f9898a90b
commit 83bfe2ff7b
13 changed files with 142 additions and 194 deletions
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crates/language_tools/src/syntax_tree_view.rs
+1 -6
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@@ -356,12 +356,7 @@ impl SyntaxTreeView {
let multibuffer = editor_state.editor.read(cx).buffer();
let multibuffer = multibuffer.read(cx).snapshot(cx);
let excerpt_id = buffer_state.excerpt_id;
let range = multibuffer
.anchor_in_excerpt(excerpt_id, range.start)
.unwrap()
..multibuffer
.anchor_in_excerpt(excerpt_id, range.end)
.unwrap();
let range = multibuffer.anchor_range_in_excerpt(excerpt_id, range)?;
// Update the editor with the anchor range.
editor_state.editor.update(cx, |editor, cx| {