[umbrello] [Bug 371990] Crash when removing pin widgets after owning component has been removed before

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https://bugs.kde.org/show_bug.cgi?id=371990

--- Comment #7 from clushkou at gmx.net ---
Thank's for commit the first part already. I've rebased and retested the fix
for the crash, and found another issue when selecting both component and
attached pin. That's fixed as well with the new patch.
I tried the suggested child/parent cleanup, but encounter several problems with
this. Briefly, the PinPortBase is a subclass of UMLWidget, but this class is
meant to represent root graphic items. The PinPortBase would be a child widget,
and needs to behave differently, e.g. when moving the parent component. I'll
continue to work on this.

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