Apply external command formatting if buffer has changed while computing it

crates/language/src/buffer.rs

@@ -569,6 +569,7 @@ impl Buffer {
                     .read_with(&cx, |this, cx| this.diff(new_text, cx))
                     .await;
                 this.update(&mut cx, |this, cx| {
+                    if this.version() == diff.base_version {
                         this.finalize_last_transaction();
                         this.apply_diff(diff, cx);
                         if let Some(transaction) = this.finalize_last_transaction().cloned() {
@@ -579,10 +580,10 @@ impl Buffer {
                                 new_mtime,
                                 cx,
                             );
-                        Ok(Some(transaction))
+                            return Ok(Some(transaction));
-                    } else {
-                        Ok(None)
                         }
+                    }
+                    Ok(None)
                 })
             } else {
                 Ok(None)
@@ -1197,25 +1198,10 @@ impl Buffer {
         self.edit([(offset..len, "\n")], None, cx);
     }
 
-    pub fn apply_diff(&mut self, diff: Diff, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
-        if self.version == diff.base_version {
-            self.start_transaction();
-            self.text.set_line_ending(diff.line_ending);
-            self.edit(diff.edits, None, cx);
-            self.end_transaction(cx)
-        } else {
-            return None;
-        }
-    }
-
     /// Apply a diff to the buffer. If the buffer has changed since the given diff was
     /// calculated, then adjust the diff to account for those changes, and discard any
     /// parts of the diff that conflict with those changes.
-    pub fn apply_non_conflicting_portion_of_diff(
+    pub fn apply_diff(&mut self, diff: Diff, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
-        &mut self,
-        diff: Diff,
-        cx: &mut ModelContext<Self>,
-    ) -> Option<TransactionId> {
         // Check for any edits to the buffer that have occurred since this diff
         // was computed.
         let snapshot = self.snapshot();
@@ -1223,7 +1209,7 @@ impl Buffer {
         let mut delta = 0;
         let adjusted_edits = diff.edits.into_iter().filter_map(|(range, new_text)| {
             while let Some(edit_since) = edits_since.peek() {
-                // If the edit occurs after a diff hunk, then it can does not
+                // If the edit occurs after a diff hunk, then it does not
                 // affect that hunk.
                 if edit_since.old.start > range.end {
                     break;

crates/language/src/buffer_tests.rs

@@ -254,7 +254,7 @@ async fn test_normalize_whitespace(cx: &mut gpui::TestAppContext) {
     let format_diff = format.await;
     buffer.update(cx, |buffer, cx| {
         let version_before_format = format_diff.base_version.clone();
-        buffer.apply_non_conflicting_portion_of_diff(format_diff, cx);
+        buffer.apply_diff(format_diff, cx);
 
         // The outcome depends on the order of concurrent taks.
         //

crates/project/src/project.rs

@@ -2921,7 +2921,7 @@ impl Project {
                         buffer.finalize_last_transaction();
                         buffer.start_transaction();
                         if let Some(diff) = trailing_whitespace_diff {
-                            buffer.apply_non_conflicting_portion_of_diff(diff, cx);
+                            buffer.apply_diff(diff, cx);
                         }
                         if ensure_final_newline {
                             buffer.ensure_final_newline(cx);