src/vs/workbench/browser/parts/titlebar/windowTitle.ts/WindowTitle/isCustomTitleFormat
class WindowTitle:	isCustomTitleFormat(): boolean {
		const title = this.configurationService.inspect<string>(WindowSettingNames.title);
		const titleSeparator = this.configurationService.inspect<string>(WindowSettingNames.titleSeparator);
		return title.value !== title.defaultValue || titleSeparator.value !== titleSeparator.defaultValue;
	}