Introduce recomputeAllData to avoid mutating pathData from outside of FilePathDiscovery

extensions/ql-vscode/src/common/vscode/file-path-discovery.ts

@@ -89,6 +89,16 @@ export abstract class FilePathDiscovery<T extends PathData> extends Discovery {
     existingData: T,
   ): boolean;
 
+  /**
+   * Update the data for every path by calling `getDataForPath`.
+   */
+  protected async recomputeAllData() {
+    this.pathData = await Promise.all(
+      this.pathData.map((p) => this.getDataForPath(p.path)),
+    );
+    this.onDidChangePathDataEmitter.fire();
+  }
+
   /**
    * Do the initial scan of the entire workspace and set up watchers for future changes.
    */

extensions/ql-vscode/src/queries-panel/query-discovery.ts

@@ -39,7 +39,7 @@ export class QueryDiscovery
 
     this.push(
       this.queryPackDiscovery.onDidChangeQueryPacks(
-        this.recomputeAllQueryLanguages.bind(this),
+        this.recomputeAllData.bind(this),
       ),
     );
   }
@@ -103,15 +103,6 @@ export class QueryDiscovery
     return newData.language !== existingData.language;
   }
 
-  private recomputeAllQueryLanguages() {
-    // All we know is that something has changed in the set of known query packs.
-    // We have no choice but to recompute the language for all queries.
-    for (const query of this.pathData) {
-      query.language = this.determineQueryLanguage(query.path);
-    }
-    this.onDidChangePathDataEmitter.fire();
-  }
-
   private determineQueryLanguage(path: string): QueryLanguage | undefined {
     return this.queryPackDiscovery.getLanguageForQueryFile(path);
   }