check if values are true not just undefined (microsoft#155348)

Author: meganrogge

src/vs/workbench/contrib/tasks/browser/abstractTaskService.ts

@@ -293,7 +293,9 @@ export abstract class AbstractTaskService extends Disposable implements ITaskSer
 		}));
 		this._taskRunningState = TASK_RUNNING_STATE.bindTo(_contextKeyService);
 		this._onDidStateChange = this._register(new Emitter());
-		this._registerCommands();
+		this._registerCommands().then(() => {
+			TaskCommandsRegistered.bindTo(this._contextKeyService).set(true);
+		});
 		this._configurationResolverService.contributeVariable('defaultBuildTask', async (): Promise<string | undefined> => {
 			let tasks = await this._getTasksForGroup(TaskGroup.Build);
 			if (tasks.length > 0) {
@@ -491,7 +493,6 @@ export abstract class AbstractTaskService extends Disposable implements ITaskSer
 				this._openTaskFile(resource, TaskSourceKind.WorkspaceFile);
 			}
 		});
-		TaskCommandsRegistered.bindTo(this._contextKeyService).set(true);
 	}
 
 	private get workspaceFolders(): IWorkspaceFolder[] {
@@ -2173,7 +2174,7 @@ export abstract class AbstractTaskService extends Disposable implements ITaskSer
 	}
 
 	private get _jsonTasksSupported(): boolean {
-		return !!ShellExecutionSupportedContext.getValue(this._contextKeyService) && !!ProcessExecutionSupportedContext.getValue(this._contextKeyService);
+		return ShellExecutionSupportedContext.getValue(this._contextKeyService) === true && ProcessExecutionSupportedContext.getValue(this._contextKeyService) === true && !Platform.isWeb;
 	}
 
 	private _computeWorkspaceFolderTasks(workspaceFolder: IWorkspaceFolder, runSource: TaskRunSource = TaskRunSource.User): Promise<IWorkspaceFolderTaskResult> {

src/vs/workbench/contrib/tasks/browser/task.contribution.ts

@@ -40,7 +40,7 @@ import { TaskDefinitionRegistry } from 'vs/workbench/contrib/tasks/common/taskDe
 import { TerminalMenuBarGroup } from 'vs/workbench/contrib/terminal/browser/terminalMenus';
 import { isString } from 'vs/base/common/types';
 
-const SHOW_TASKS_COMMANDS_CONTEXT = ContextKeyExpr.or(ShellExecutionSupportedContext, ProcessExecutionSupportedContext);
+const SHOW_TASKS_COMMANDS_CONTEXT = ContextKeyExpr.and(ShellExecutionSupportedContext, ProcessExecutionSupportedContext, TaskCommandsRegistered);
 
 const workbenchRegistry = Registry.as<IWorkbenchContributionsRegistry>(WorkbenchExtensions.Workbench);
 workbenchRegistry.registerWorkbenchContribution(RunAutomaticTasks, LifecyclePhase.Eventually);