Ugly brackets in the menu (fixes #6413)

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

@@ -789,7 +789,7 @@ function __separator__(): Electron.MenuItem {
 
 function mnemonicLabel(label: string): string {
 	if (platform.isMacintosh) {
-		return label.replace(/&&/g, ''); // no mnemonic support on mac
+		return label.replace(/\(&&\w\)|&&/g, ''); // no mnemonic support on mac/linux
 	}
 
 	return label.replace(/&&/g, '&');

src/vs/workbench/parts/files/electron-browser/textFileServices.ts

@@ -217,7 +217,7 @@ export class TextFileService extends AbstractTextFileService {
 
 	private mnemonicLabel(label: string): string {
 		if (!isWindows) {
-			return label.replace(/&&/g, ''); // no mnemonic support on mac/linux in buttons yet
+			return label.replace(/\(&&\w\)|&&/g, ''); // no mnemonic support on mac/linux
 		}
 
 		return label.replace(/&&/g, '&');

src/vs/workbench/services/message/electron-browser/messageService.ts

@@ -64,7 +64,7 @@ export class MessageService extends WorkbenchMessageService {
 
 	private mnemonicLabel(label: string): string {
 		if (!isWindows) {
-			return label.replace(/&&/g, ''); // no mnemonic support on mac/linux in buttons yet
+			return label.replace(/\(&&\w\)|&&/g, ''); // no mnemonic support on mac/linux
 		}
 
 		return label.replace(/&&/g, '&');