src/vs/workbench/electron-sandbox/parts/titlebar/titlebarPart.ts/TitlebarPart/onMenubarFocusChanged
class TitlebarPart:	private onMenubarFocusChanged(focused: boolean): void {
		if ((isWindows || isLinux) && this.currentMenubarVisibility !== 'compact' && this.dragRegion) {
			if (focused) {
				hide(this.dragRegion);
			} else {
				show(this.dragRegion);
			}
		}
	}