Issue: The user can't tell now which window decorations are system-installed. In addition, the user has to go to the Get New Stuff Dialog to delete the themes. The kcms for Desktop Themes and Icons do this right: they show a delete icon for themes and grey out the icons of the system installed ones. The user doesn't have to go to Get New Stuff to delete their themes. The kcm for Window Decorations should behave the same, if possible.
It is planned to rewrite the KCM in the same way as the other grid-ones, it's just a bit more challenging as it also has this decoration button settings that need porting then.
Ah, I didn't know it's already planned, thanks :)
The KCM has been rewritten with the QML user interface, but still does not allow deleting GHNS-originated windeco themes using an inline delete button on the delegates.
*** Bug 438356 has been marked as a duplicate of this bug. ***
*** Bug 462395 has been marked as a duplicate of this bug. ***