Fix file-watching bug in QLTest discovery

Author: Dave Bartolomeo

extensions/ql-vscode/src/qltest-discovery.ts

@@ -152,6 +152,7 @@ export class QLTestDiscovery extends Discovery<QLTestDiscoveryResults> {
     super();
 
     this.push(this.qlPackDiscovery.onDidChangeQLPacks(this.handleDidChangeQLPacks, this));
+    this.push(this.watcher.onDidChange(this.handleDidChange, this));
 
     this.refresh();
   }
@@ -170,6 +171,10 @@ export class QLTestDiscovery extends Discovery<QLTestDiscoveryResults> {
     this.refresh();
   }
 
+  private handleDidChange(uri: Uri): void {
+    this.refresh();
+  }
+
   protected async discover(): Promise<QLTestDiscoveryResults> {
     const testDirectories: QLTestDirectory[] = [];
     const watchPaths: string[] = [];