Ensure tasks are resolved when run from extension host

src/vs/workbench/api/browser/mainThreadTask.ts

@@ -534,20 +534,47 @@ export class MainThreadTask implements MainThreadTaskShape {
 		}
 	}
 
-	public $executeTask(value: TaskDTO): Promise<TaskExecutionDTO> {
+	// Passing in a TaskHandleDTO will cause the task to get re-resolved, which is important for tasks are coming from the core,
+	// such as those gotten from a fetchTasks, since they can have missing configuration properties.
+	public $executeTask(value: TaskHandleDTO | TaskDTO): Promise<TaskExecutionDTO> {
 		return new Promise<TaskExecutionDTO>((resolve, reject) => {
-			const task = TaskDTO.to(value, this._workspaceContextServer, true)!;
-			this._taskService.run(task).then(undefined, reason => {
-				// eat the error, it has already been surfaced to the user and we don't care about it here
-			});
-			const result: TaskExecutionDTO = {
-				id: task._id,
-				task: TaskDTO.from(task)
-			};
-			resolve(result);
+			if (TaskHandleDTO.is(value)) {
+				const workspaceFolder = typeof value.workspaceFolder === 'string' ? value.workspaceFolder : this._workspaceContextServer.getWorkspaceFolder(URI.revive(value.workspaceFolder));
+				if (workspaceFolder) {
+					this._taskService.getTask(workspaceFolder, value.id, true).then((task: Task | undefined) => {
+						if (!task) {
+							reject(new Error('Task not found'));
+						} else {
+							this._taskService.run(task).then(undefined, reason => {
+								// eat the error, it has already been surfaced to the user and we don't care about it here
+							});
+							const result: TaskExecutionDTO = {
+								id: value.id,
+								task: TaskDTO.from(task)
+							};
+							resolve(result);
+						}
+					}, (_error) => {
+						reject(new Error('Task not found'));
+					});
+				} else {
+					reject(new Error('No workspace folder'));
+				}
+			} else {
+				const task = TaskDTO.to(value, this._workspaceContextServer, true)!;
+				this._taskService.run(task).then(undefined, reason => {
+					// eat the error, it has already been surfaced to the user and we don't care about it here
+				});
+				const result: TaskExecutionDTO = {
+					id: task._id,
+					task: TaskDTO.from(task)
+				};
+				resolve(result);
+			}
 		});
 	}
 
+
 	public $customExecutionComplete(id: string, result?: number): Promise<void> {
 		return new Promise<void>((resolve, reject) => {
 			this._taskService.getActiveTasks().then((tasks) => {

src/vs/workbench/api/common/extHost.protocol.ts

@@ -780,7 +780,7 @@ export interface MainThreadTaskShape extends IDisposable {
 	$unregisterTaskProvider(handle: number): Promise<void>;
 	$fetchTasks(filter?: tasks.TaskFilterDTO): Promise<tasks.TaskDTO[]>;
 	$getTaskExecution(value: tasks.TaskHandleDTO | tasks.TaskDTO): Promise<tasks.TaskExecutionDTO>;
-	$executeTask(task: tasks.TaskDTO): Promise<tasks.TaskExecutionDTO>;
+	$executeTask(task: tasks.TaskHandleDTO | tasks.TaskDTO): Promise<tasks.TaskExecutionDTO>;
 	$terminateTask(id: string): Promise<void>;
 	$registerTaskSystem(scheme: string, info: tasks.TaskSystemInfoDTO): void;
 	$customExecutionComplete(id: string, result?: number): Promise<void>;

src/vs/workbench/api/node/extHostTask.ts

@@ -54,12 +54,13 @@ export class ExtHostTask extends ExtHostTaskBase {
 		// We have a preserved ID. So the task didn't change.
 		if (tTask._id !== undefined) {
 			// Always get the task execution first to prevent timing issues when retrieving it later
-			const executionDTO = await this._proxy.$getTaskExecution(TaskHandleDTO.from(tTask));
+			const handleDto = TaskHandleDTO.from(tTask);
+			const executionDTO = await this._proxy.$getTaskExecution(handleDto);
 			if (executionDTO.task === undefined) {
 				throw new Error('Task from execution DTO is undefined');
 			}
 			const execution = await this.getTaskExecution(executionDTO, task);
-			this._proxy.$executeTask(executionDTO.task).catch(() => { /* The error here isn't actionable. */ });
+			this._proxy.$executeTask(handleDto).catch(() => { /* The error here isn't actionable. */ });
 			return execution;
 		} else {
 			const dto = TaskDTO.from(task, extension);