Set relaunch command for window (for #13905)

src/typings/electron.d.ts

@@ -1318,6 +1318,18 @@ declare namespace Electron {
 		 * Note: This API is available only on Windows.
 		 */
 		setThumbnailToolTip(toolTip: string): boolean;
+		/**
+		 * Sets the application id, app icon, relaunch command and relaunch display name
+		 * for the given window. appIconIndex should be set to 0 if the app icon
+		 * file only has a single icon.
+		 */
+		setAppDetails(options: {
+			appId?: string;
+			appIconPath?: string;
+			appIconIndex?: number;
+			relaunchCommand?: string;
+			relaunchDisplayName?: string;
+		}): void;
 		/**
 		 * Same as webContents.showDefinitionForSelection().
 		 * Note: This API is available only on macOS.

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

@@ -219,6 +219,15 @@ export class VSCodeWindow {
 			this._win.setSheetOffset(22); // offset dialogs by the height of the custom title bar if we have any
 		}
 
+		// Set relaunch command
+		if (platform.isWindows && product.win32AppUserModelId && typeof this._win.setAppDetails === 'function') {
+			this._win.setAppDetails({
+				appId: product.win32AppUserModelId,
+				relaunchCommand: `"${process.execPath}" -n`,
+				relaunchDisplayName: product.nameLong
+			});
+		}
+
 		if (isFullscreenOrMaximized) {
 			this.win.maximize();
 
@@ -769,4 +778,4 @@ export class VSCodeWindow {
 
 		this._win = null; // Important to dereference the window object to allow for GC
 	}
-}
+}