fix command not found warning (microsoft#155250)

fix command not found part of microsoft#155163

Author: meganrogge

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

@@ -57,7 +57,7 @@ import {
 	TaskSettingId,
 	TasksSchemaProperties
 } from 'vs/workbench/contrib/tasks/common/tasks';
-import { ITaskService, ITaskProvider, IProblemMatcherRunOptions, ICustomizationProperties, ITaskFilter, IWorkspaceFolderTaskResult, CustomExecutionSupportedContext, ShellExecutionSupportedContext, ProcessExecutionSupportedContext } from 'vs/workbench/contrib/tasks/common/taskService';
+import { ITaskService, ITaskProvider, IProblemMatcherRunOptions, ICustomizationProperties, ITaskFilter, IWorkspaceFolderTaskResult, CustomExecutionSupportedContext, ShellExecutionSupportedContext, ProcessExecutionSupportedContext, TaskCommandsRegistered } from 'vs/workbench/contrib/tasks/common/taskService';
 import { getTemplates as getTaskTemplates } from 'vs/workbench/contrib/tasks/common/taskTemplates';
 
 import * as TaskConfig from '../common/taskConfiguration';
@@ -491,6 +491,7 @@ export abstract class AbstractTaskService extends Disposable implements ITaskSer
 				this._openTaskFile(resource, TaskSourceKind.WorkspaceFile);
 			}
 		});
+		TaskCommandsRegistered.bindTo(this._contextKeyService).set(true);
 	}
 
 	private get workspaceFolders(): IWorkspaceFolder[] {

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

@@ -21,7 +21,7 @@ import { StatusbarAlignment, IStatusbarService, IStatusbarEntryAccessor, IStatus
 import { IOutputChannelRegistry, Extensions as OutputExt } from 'vs/workbench/services/output/common/output';
 
 import { ITaskEvent, TaskEventKind, TaskGroup, TaskSettingId, TASKS_CATEGORY, TASK_RUNNING_STATE } from 'vs/workbench/contrib/tasks/common/tasks';
-import { ITaskService, ProcessExecutionSupportedContext, ShellExecutionSupportedContext } from 'vs/workbench/contrib/tasks/common/taskService';
+import { ITaskService, ProcessExecutionSupportedContext, ShellExecutionSupportedContext, TaskCommandsRegistered } from 'vs/workbench/contrib/tasks/common/taskService';
 
 import { Extensions as WorkbenchExtensions, IWorkbenchContributionsRegistry, IWorkbenchContribution } from 'vs/workbench/common/contributions';
 import { RunAutomaticTasks, ManageAutomaticTaskRunning } from 'vs/workbench/contrib/tasks/browser/runAutomaticTasks';
@@ -359,7 +359,7 @@ MenuRegistry.appendMenuItem(MenuId.CommandPalette, {
 KeybindingsRegistry.registerKeybindingRule({
 	id: 'workbench.action.tasks.build',
 	weight: KeybindingWeight.WorkbenchContrib,
-	when: undefined,
+	when: TaskCommandsRegistered,
 	primary: KeyMod.CtrlCmd | KeyMod.Shift | KeyCode.KeyB
 });
 

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

@@ -19,6 +19,7 @@ export { ITaskSummary, Task, ITaskTerminateResponse as TaskTerminateResponse };
 
 export const CustomExecutionSupportedContext = new RawContextKey<boolean>('customExecutionSupported', true, nls.localize('tasks.customExecutionSupported', "Whether CustomExecution tasks are supported. Consider using in the when clause of a \'taskDefinition\' contribution."));
 export const ShellExecutionSupportedContext = new RawContextKey<boolean>('shellExecutionSupported', false, nls.localize('tasks.shellExecutionSupported', "Whether ShellExecution tasks are supported. Consider using in the when clause of a \'taskDefinition\' contribution."));
+export const TaskCommandsRegistered = new RawContextKey<boolean>('taskCommandsRegistered', false, nls.localize('tasks.taskCommandsRegistered', "Whether the task commands have been registered yet"));
 export const ProcessExecutionSupportedContext = new RawContextKey<boolean>('processExecutionSupported', false, nls.localize('tasks.processExecutionSupported', "Whether ProcessExecution tasks are supported. Consider using in the when clause of a \'taskDefinition\' contribution."));
 
 export const ITaskService = createDecorator<ITaskService>('taskService');