src/vs/platform/windows/electron-main/windowImpl.ts/CodeWindow/getMenuBarVisibility
class CodeWindow:	private getMenuBarVisibility(): MenuBarVisibility {
		let menuBarVisibility = getMenuBarVisibility(this.configurationService);
		if (['visible', 'toggle', 'hidden'].indexOf(menuBarVisibility) < 0) {
			menuBarVisibility = 'classic';
		}

		return menuBarVisibility;
	}