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

[Ralf Habacker]

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

--- Comment #22 from Ralf Habacker <ralf.habacker at freenet.de> ---
(In reply to clushkou from comment #20)
> I tried to fulfill your request in comment #17, but do not understand how to
> achieve this. If I simply move the calls to ComponentWidget, I get a crash
> on undo because restoring of child element does not work.
> In addition, if the code needs to be added to ComponentWidget, the same
> adaption is needed in all widgets that allow child Pins / Ports.

I see. For the record: umbrello uses saveToXMI and loadFromXMI() to handle xmi
file save/load, object (de)serialisation on copy/paste between same and other
umbrello instances and undo framework so it would be nice to hold related stuff
together and to implement stuff in the same way if possible to reduce req

What I did: I created a component widget with ports and saved it into a xmi
file. Inspecting this file shows that the component widget and the pin widgets
does not have any direct association. The association is performed by the
related  UML:Component which has UML:Port as child. The in-memory
representation changes this behavior by adding a direct association former with
m_pow and now this QGraphicsItem child api.

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