Maximilian Schiller authored May 29, 2020 and Kurt Hindenburg committed May 29, 2020

Assign the _view as the parent to the KXMLGuiFactory because the
factory is referencing the view widget as its associated widget. Since
the TerminalDisplay gets destructed first this is now a dangling
pointer. If the view is set as the parent the factory gets cleaned up
correctly.  Also cleanup the created clientBuilder after destruction
because it can't have a parent and would probably leak memory.

BUG: 415762
FIXED-IN: 20.08.0
See also !87