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Fix performance regression in multibuffer diff syncing (#26137)

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This fixes a performance problem introduced in #25906 and caused by
calling `BufferDiff::snapshot` too frequently.

Release Notes:

- Fixed a performance regression related to buffer diffs

Co-authored-by: Conrad <conrad@zed.dev>
This commit is contained in:
Cole Miller 2025-03-05 12:25:51 -05:00 • committed by GitHub
parent aaa506c061
commit ad9c508a72
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GPG key ID: B5690EEEBB952194
1 changed files with 9 additions and 3 deletions
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12
crates/multi_buffer/src/multi_buffer.rs
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@ -2045,6 +2045,7 @@ impl MultiBuffer {
.cursor::<(Option<&Locator>, ExcerptOffset)>(&());
let mut edits = Vec::new();
let mut excerpt_ids = ids.iter().copied().peekable();
let mut removed_buffer_ids = Vec::new();
while let Some(excerpt_id) = excerpt_ids.next() {
// Seek to the next excerpt to remove, preserving any preceding excerpts.
@ -2067,7 +2068,7 @@ impl MultiBuffer {
excerpt.buffer_id
);
buffers.remove(&excerpt.buffer_id);
self.diffs.remove(&excerpt.buffer_id);
removed_buffer_ids.push(excerpt.buffer_id);
}
}
cursor.next(&());
@ -2108,6 +2109,10 @@ impl MultiBuffer {
new_excerpts.append(suffix, &());
drop(cursor);
snapshot.excerpts = new_excerpts;
for buffer_id in removed_buffer_ids {
self.diffs.remove(&buffer_id);
snapshot.diffs.remove(&buffer_id);
}
if changed_trailing_excerpt {
snapshot.trailing_excerpt_update_count += 1;
@ -2741,9 +2746,10 @@ impl MultiBuffer {
snapshot.has_deleted_file = has_deleted_file;
snapshot.has_conflict = has_conflict;
snapshot.diffs.retain(|_, _| false);
for (id, diff) in self.diffs.iter() {
snapshot.diffs.insert(*id, diff.diff.read(cx).snapshot(cx));
if snapshot.diffs.get(&id).is_none() {
snapshot.diffs.insert(*id, diff.diff.read(cx).snapshot(cx));
}
}
excerpts_to_edit.sort_unstable_by_key(|(locator, _, _)| *locator);