Merge from vscode 1eb87b0e9ce9886afeaecec22b31abd0d9b7939f (#7282)

* Merge from vscode 1eb87b0e9ce9886afeaecec22b31abd0d9b7939f

* fix various icon issues

* fix preview features

src/vs/platform/electron/electron-main/electronMainService.ts

@@ -0,0 +1,47 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { IElectronService } from 'vs/platform/electron/node/electron';
+import { IWindowsMainService, ICodeWindow } from 'vs/platform/windows/electron-main/windows';
+import { MessageBoxOptions, MessageBoxReturnValue, shell } from 'electron';
+
+export class ElectronMainService implements IElectronService {
+
+	_serviceBrand: undefined;
+
+	constructor(
+		@IWindowsMainService private readonly windowsMainService: IWindowsMainService
+	) {
+	}
+
+	//#region Window
+
+	private get window(): ICodeWindow | undefined {
+		return this.windowsMainService.getFocusedWindow() || this.windowsMainService.getLastActiveWindow();
+	}
+
+	async windowCount(): Promise<number> {
+		return this.windowsMainService.getWindowCount();
+	}
+
+	//#endregion
+
+	//#region Other
+
+	async showMessageBox(options: MessageBoxOptions): Promise<MessageBoxReturnValue> {
+		const result = await this.windowsMainService.showMessageBox(options, this.window);
+
+		return {
+			response: result.button,
+			checkboxChecked: !!result.checkboxChecked
+		};
+	}
+
+	async showItemInFolder(path: string): Promise<void> {
+		shell.showItemInFolder(path);
+	}
+
+	//#endregion
+}