debug: make sure to send configurationDone only after breakpoints response arrives.

src/vs/workbench/parts/debug/electron-browser/debugService.ts

@@ -222,9 +222,8 @@ export class DebugService extends ee.EventEmitter implements debug.IDebugService
 
 	private registerSessionListeners(): void {
 		this.toDispose.push(this.session.addListener2(debug.SessionEvents.INITIALIZED, (event: DebugProtocol.InitializedEvent) => {
-			this.sendAllBreakpoints().done(null, errors.onUnexpectedError);
-			this.sendExceptionBreakpoints().done(null, errors.onUnexpectedError);
-			this.session.configurationDone().done(null, errors.onUnexpectedError);
+			Promise.join([this.sendAllBreakpoints(), this.sendExceptionBreakpoints()]).then(() =>
+				this.session.configurationDone()).done(null, errors.onUnexpectedError);
 		}));
 
 		this.toDispose.push(this.session.addListener2(debug.SessionEvents.STOPPED, (event: DebugProtocol.StoppedEvent) => {