it is inheritly widgets-dependent.

Very few apps actually make use of it

The acutal implementation is one line, so apps that really want it can do it themselves

QApplication::alert(notification->widget());

Apps that use NotifyByTaskbar by default:

• KMessageBox via the weird notification interface thing (T12526)
• KTP
• KDevelop (https://invent.kde.org/kde/kdevelop/merge_requests/86)