D9189: Do not crash when completion object gets destroyed underneath us

[Milian Wolff]

mwolff added inline comments.

INLINE COMMENTS

> mwolff wrote in kcombobox.cpp:317
> can you be more specific, such that I can build a unit test out of this? And are you saying that `QComboBox::setLineEdit` is deleting the line edit?

ah I think I got it now, thanks for the hint!

REPOSITORY
  R284 KCompletion

REVISION DETAIL
  https://phabricator.kde.org/D9189

To: mwolff, dfaure
Cc: anthonyfieroni, dfaure, #frameworks
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