Checking system shutdown inhibition before closing session
The KDE plasma desktop doesn't check the system shutdown inhibition when the user clicks on the shutdown button. Indeed when the user click on the shutdown button, the session is closed (but the system doesn't shutdown due to inhibition) so the user is lock on a black screen with only his mouse moving).
Expected : when the user click on shutdown, the user rights elevation dialog should appear to override the system inhibition.
This behavior should be applied on restart, sleep, etc.