Review Request 118639: KCMultiDialog: Fix crash when clicking OK

[Aurélien Gâteau]

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https://git.reviewboard.kde.org/r/118639/
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Review request for KDE Frameworks.


Repository: kcmutils


Description
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When one closes KCMultiDialog with OK, QDialog::finished() can be emitted before the clicked() signal of the OK button. This causes the following sequence to happen:

- KCMultiDialogPrivate::_k_dialogClosed
  * deletes the KCModule
    - KCModuleProxyPrivate::_k_moduleDestroyed
      * sets kcm to 0

- KCMultiDialog::slotOkClicked
  - KCMultiDialogPrivate::apply
    - KCModuleProxy::save
      - KCModuleProxyPrivate::realModule
        * notices kcm is 0, so recreates it
        * calls kcm->save()
          - KWinDesktopConfig::save()
            * crashes because it expects kcm->load() to have been called

To avoid this, trigger the cleanup code in closeEvent() rather than when finished() is emitted, as we can be sure closeEvent() is always called *after* the methods connected to the button box signals has executed.


Diffs
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  src/kcmultidialog.h 72e45a5 
  src/kcmultidialog.cpp 478c25a 

Diff: https://git.reviewboard.kde.org/r/118639/diff/


Testing
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Configuring virtual desktops does not crash anymore


Thanks,

Aurélien Gâteau

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