Fix issue where renaming a file would not update imports in related files if they are not open (#36681)

Closes #34445

Now we open a multi-buffer consisting of buffers that have updated,
renamed file imports.

Only local is handled, for now.

Release Notes:

- Fixed an issue where renaming a file would not update imports in
related files if they are not already open.

crates/project/src/lsp_store.rs

@@ -8762,7 +8762,7 @@ impl LspStore {
             (root_path.join(&old_path), root_path.join(&new_path))
         };
 
-        Self::will_rename_entry(
+        let _transaction = Self::will_rename_entry(
             this.downgrade(),
             worktree_id,
             &old_abs_path,
@@ -9224,7 +9224,7 @@ impl LspStore {
         new_path: &Path,
         is_dir: bool,
         cx: AsyncApp,
-    ) -> Task<()> {
+    ) -> Task<ProjectTransaction> {
         let old_uri = lsp::Url::from_file_path(old_path).ok().map(String::from);
         let new_uri = lsp::Url::from_file_path(new_path).ok().map(String::from);
         cx.spawn(async move |cx| {
@@ -9257,7 +9257,7 @@ impl LspStore {
                                     .log_err()
                                     .flatten()?;
 
-                                LocalLspStore::deserialize_workspace_edit(
+                                let transaction = LocalLspStore::deserialize_workspace_edit(
                                     this.upgrade()?,
                                     edit,
                                     false,
@@ -9265,8 +9265,8 @@ impl LspStore {
                                     cx,
                                 )
                                 .await
-                                .ok();
-                                Some(())
+                                .ok()?;
+                                Some(transaction)
                             }
                         });
                         tasks.push(apply_edit);
@@ -9276,11 +9276,17 @@ impl LspStore {
             })
             .ok()
             .flatten();
+            let mut merged_transaction = ProjectTransaction::default();
             for task in tasks {
                 // Await on tasks sequentially so that the order of application of edits is deterministic
                 // (at least with regards to the order of registration of language servers)
-                task.await;
+                if let Some(transaction) = task.await {
+                    for (buffer, buffer_transaction) in transaction.0 {
+                        merged_transaction.0.insert(buffer, buffer_transaction);
+                    }
+                }
             }
+            merged_transaction
         })
     }