Only offer task problem matcher attach in V2

src/vs/workbench/parts/tasks/browser/buildQuickOpen.ts

@@ -27,7 +27,7 @@ class TaskEntry extends base.TaskEntry {
 			return false;
 		}
 		let task = this._task;
-		if (task.problemMatchers === void 0 || task.problemMatchers.length === 0) {
+		if (this.taskService.canCustomize() && task.problemMatchers === void 0 || task.problemMatchers.length === 0) {
 			this.attachProblemMatcher(task).then((task) => {
 				this.doRun(task);
 			});

src/vs/workbench/parts/tasks/browser/taskQuickOpen.ts

@@ -27,7 +27,7 @@ class TaskEntry extends base.TaskEntry {
 			return false;
 		}
 		let task = this._task;
-		if (task.group === TaskGroup.Build && ((task.problemMatchers === void 0) || task.problemMatchers.length === 0)) {
+		if (this.taskService.canCustomize() && task.group === TaskGroup.Build && ((task.problemMatchers === void 0) || task.problemMatchers.length === 0)) {
 			this.attachProblemMatcher(task).then(task => this.doRun(task));
 			return true;
 		} else {

src/vs/workbench/parts/tasks/common/taskService.ts

@@ -45,6 +45,7 @@ export interface ITaskService extends IEventEmitter {
 	getTasksForGroup(group: string): TPromise<Task[]>;
 	getRecentlyUsedTasks(): LinkedMap<string, string>;
 
+	canCustomize(): boolean;
 	customize(task: Task, properties?: { problemMatcher: string | string[] }, openConfig?: boolean): TPromise<void>;
 
 	registerTaskProvider(handle: number, taskProvider: ITaskProvider): void;

src/vs/workbench/parts/tasks/electron-browser/task.contribution.ts

@@ -816,6 +816,10 @@ class TaskService extends EventEmitter implements ITaskService {
 		});
 	}
 
+	public canCustomize(): boolean {
+		return this.getJsonSchemaVersion() === JsonSchemaVersion.V2_0_0;
+	}
+
 	public customize(task: Task, properties?: { problemMatcher: string | string[] }, openConfig?: boolean): TPromise<void> {
 		if (!ContributedTask.is(task)) {
 			return TPromise.as<void>(undefined);

src/vs/workbench/parts/tasks/electron-browser/terminalTaskSystem.ts

@@ -428,8 +428,9 @@ export class TerminalTaskSystem extends EventEmitter implements ITaskSystem {
 			let shellArgs = <string[]>shellLaunchConfig.args.slice(0);
 			let toAdd: string[] = [];
 			let commandLine = args && args.length > 0 ? `${command} ${args.join(' ')}` : `${command}`;
+			let basename: string;
 			if (Platform.isWindows) {
-				let basename = path.basename(shellLaunchConfig.executable).toLowerCase();
+				basename = path.basename(shellLaunchConfig.executable).toLowerCase();
 				if (basename === 'powershell.exe') {
 					if (!shellSpecified) {
 						toAdd.push('-Command');