bendns' repos / rust-analyzer
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Diffstat
-rw-r--r--crates/syntax/src/syntax_editor.rs20
1 files changed, 17 insertions, 3 deletions
diff --git a/crates/syntax/src/syntax_editor.rs b/crates/syntax/src/syntax_editor.rs
index c536f8ce14..6bad93ebf8 100644
--- a/crates/syntax/src/syntax_editor.rs
+++ b/crates/syntax/src/syntax_editor.rs
@@ -161,9 +161,23 @@ impl SyntaxEditor {
pub fn replace(&self, old: impl Element, new: impl Element) {
let old = old.syntax_element();
debug_assert!(is_ancestor_or_self_of_element(&old, &self.root));
- self.changes
- .borrow_mut()
- .push(Change::Replace(old.syntax_element(), Some(new.syntax_element())));
+ let new = new.syntax_element();
+ let mut changes = self.changes.borrow_mut();
+ for change in changes.iter_mut() {
+ if let Change::Replace(existing, replacement) = change
+ && *existing == old
+ {
+ match replacement {
+ None => return,
+ Some(existing_new) if *existing_new == new => return,
+ Some(existing_new) => {
+ *existing_new = new;
+ return;
+ }
+ }
+ }
+ }
+ changes.push(Change::Replace(old, Some(new)));
}
pub fn replace_with_many(&self, old: impl Element, new: Vec<SyntaxElement>) {