Allow preLaunch task for compound list

fixes #45676

src/vs/workbench/contrib/debug/browser/debugService.ts

@@ -289,6 +289,13 @@ export class DebugService implements IDebugService {
 					throw new Error(nls.localize({ key: 'compoundMustHaveConfigurations', comment: ['compound indicates a "compounds" configuration item', '"configurations" is an attribute and should not be localized'] },
 						"Compound must have \"configurations\" attribute set in order to start multiple configurations."));
 				}
+				if (compound.preLaunchTask) {
+					const taskResult = await this.runTaskAndCheckErrors(launch?.workspace || this.contextService.getWorkspace(), compound.preLaunchTask);
+					if (taskResult === TaskRunResult.Failure) {
+						this.endInitializingState();
+						return false;
+					}
+				}
 
 				const values = await Promise.all(compound.configurations.map(configData => {
 					const name = typeof configData === 'string' ? configData : configData.name;
@@ -394,10 +401,10 @@ export class DebugService implements IDebugService {
 					return false;
 				}
 
-				const workspace = launch ? launch.workspace : undefined;
+				const workspace = launch ? launch.workspace : this.contextService.getWorkspace();
 				const taskResult = await this.runTaskAndCheckErrors(workspace, resolvedConfig.preLaunchTask);
 				if (taskResult === TaskRunResult.Success) {
-					return this.doCreateSession(workspace, { resolved: resolvedConfig, unresolved: unresolvedConfig }, options);
+					return this.doCreateSession(launch?.workspace, { resolved: resolvedConfig, unresolved: unresolvedConfig }, options);
 				}
 				return false;
 			} catch (err) {
@@ -701,7 +708,7 @@ export class DebugService implements IDebugService {
 
 	//---- task management
 
-	private async runTaskAndCheckErrors(root: IWorkspaceFolder | undefined, taskId: string | TaskIdentifier | undefined): Promise<TaskRunResult> {
+	private async runTaskAndCheckErrors(root: IWorkspaceFolder | IWorkspace | undefined, taskId: string | TaskIdentifier | undefined): Promise<TaskRunResult> {
 		try {
 			const taskSummary = await this.runTask(root, taskId);
 

src/vs/workbench/contrib/debug/common/debug.ts

@@ -505,6 +505,7 @@ export interface IConfig extends IEnvConfig {
 
 export interface ICompound {
 	name: string;
+	preLaunchTask?: string | TaskIdentifier;
 	configurations: (string | { name: string, folder: string })[];
 }
 

src/vs/workbench/contrib/debug/common/debugSchemas.ts

@@ -190,6 +190,11 @@ export const launchSchema: IJSONSchema = {
 							}]
 						},
 						description: nls.localize('app.launch.json.compounds.configurations', "Names of configurations that will be started as part of this compound.")
+					},
+					preLaunchTask: {
+						type: 'string',
+						default: '',
+						description: nls.localize('compoundPrelaunchTask', "Task to run before any of the compound configurations start.")
 					}
 				},
 				default: defaultCompound