Fix runtime warning on disconnect() called from QObject dtor
Review Request #128620 - Created Aug. 7, 2016 and submitted
QObject::disconnect: No such signal QObject::modelReset() in katecompletionwidget.cpp:1325 My solution is to use different code paths for unregistering a real completion object, and for unregistering a destroyed completion object (which has already been reduced to a QObject).
This warning was showing up e.g. at the end of