Call AllowSetForegroundWindow before sending IPC

build/gulpfile.vscode.js

@@ -268,6 +268,7 @@ function packageTask(platform, arch, opts) {
 			.pipe(util.cleanNodeModule('oniguruma', ['binding.gyp', 'build/**', 'src/**', 'deps/**'], ['**/*.node']))
 			.pipe(util.cleanNodeModule('windows-mutex', ['binding.gyp', 'build/**', 'src/**'], ['**/*.node']))
 			.pipe(util.cleanNodeModule('native-keymap', ['binding.gyp', 'build/**', 'src/**', 'deps/**'], ['**/*.node']))
+			.pipe(util.cleanNodeModule('windows-foreground-love', ['binding.gyp', 'build/**', 'src/**'], ['**/*.node']))
 			.pipe(util.cleanNodeModule('gc-signals', ['binding.gyp', 'build/**', 'src/**', 'deps/**'], ['**/*.node', 'src/index.js']))
 			.pipe(util.cleanNodeModule('pty.js', ['binding.gyp', 'build/**', 'src/**', 'deps/**'], ['build/Release/**']));
 

package.json

@@ -108,6 +108,7 @@
     }
   },
   "optionalDependencies": {
+    "windows-foreground-love": "0.1.0",
     "windows-mutex": "^0.2.0",
     "fsevents": "0.3.8"
   }

src/typings/windows-foreground-love.d.ts

@@ -0,0 +1,10 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+declare module 'windows-foreground-love' {
+
+	export function allowSetForegroundWindow(pid?: number): boolean;
+
+}

src/vs/code/electron-main/launch.ts

@@ -21,10 +21,12 @@ export interface IStartArguments {
 
 export interface ILaunchService {
 	start(args: ParsedArgs, userEnv: IProcessEnvironment): TPromise<void>;
+	getMainProcessId(): TPromise<number>;
 }
 
 export interface ILaunchChannel extends IChannel {
 	call(command: 'start', arg: IStartArguments): TPromise<void>;
+	call(command: 'get-main-process-id', arg: null): TPromise<any>;
 	call(command: string, arg: any): TPromise<any>;
 }
 
@@ -33,10 +35,13 @@ export class LaunchChannel implements ILaunchChannel {
 	constructor(private service: ILaunchService) { }
 
 	call(command: string, arg: any): TPromise<any> {
-		const { args, userEnv } = arg as IStartArguments;
-
 		switch (command) {
-			case 'start': return this.service.start(args, userEnv);
+			case 'start':
+				const { args, userEnv } = arg as IStartArguments;
+				return this.service.start(args, userEnv);
+
+			case 'get-main-process-id':
+				return this.service.getMainProcessId();
 		}
 	}
 }
@@ -48,6 +53,10 @@ export class LaunchChannelClient implements ILaunchService {
 	start(args: ParsedArgs, userEnv: IProcessEnvironment): TPromise<void> {
 		return this.channel.call('start', { args, userEnv });
 	}
+
+	getMainProcessId(): TPromise<number> {
+		return this.channel.call('get-main-process-id', null);
+	}
 }
 
 export class LaunchService implements ILaunchService {
@@ -105,4 +114,9 @@ export class LaunchService implements ILaunchService {
 
 		return TPromise.as(null);
 	}
+
+	getMainProcessId(): TPromise<number> {
+		this.logService.log('Received request for process ID from other instance.');
+		return TPromise.as(process.pid);
+	}
 }

src/vs/code/electron-main/main.ts

@@ -299,7 +299,22 @@ function setupIPC(accessor: ServicesAccessor): TPromise<Server> {
 					const channel = client.getChannel<ILaunchChannel>('launch');
 					const service = new LaunchChannelClient(channel);
 
-					return service.start(environmentService.args, process.env)
+					let promise = TPromise.as(null);
+					if (platform.isWindows) {
+						promise = service.getMainProcessId()
+							.then(processId => {
+								logService.log('Sending some foreground love to the running instance:', processId);
+								try {
+									const { allowSetForegroundWindow } = <any>require.__$__nodeRequire('windows-foreground-love');
+									allowSetForegroundWindow(processId);
+								} catch (e) {
+									// noop
+								}
+							});
+					}
+
+					return promise
+						.then(() => service.start(environmentService.args, process.env))
 						.then(() => client.dispose())
 						.then(() => TPromise.wrapError('Sent env to running instance. Terminating...'));
 				},