Review Request 118639: KCMultiDialog: Fix crash when clicking OK

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https://git.reviewboard.kde.org/r/118639/#review59933
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This review has been submitted with commit cc99fac3af737619ea220ccb7059f0d8f0623efa by Aurélien Gâteau to branch master.

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On June 10, 2014, 8:45 p.m., Aurélien Gâteau wrote:
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> https://git.reviewboard.kde.org/r/118639/
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> (Updated June 10, 2014, 8:45 p.m.)
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> Review request for KDE Frameworks.
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> Bugs: 334624
>     https://bugs.kde.org/show_bug.cgi?id=334624
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> Repository: kcmutils
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> 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:
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> - KCMultiDialogPrivate::_k_dialogClosed
>   * deletes the KCModule
>     - KCModuleProxyPrivate::_k_moduleDestroyed
>       * sets kcm to 0
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> - 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
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> 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.
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> Diffs
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>   src/kcmultidialog.h 72e45a5 
>   src/kcmultidialog.cpp 478c25a 
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> Diff: https://git.reviewboard.kde.org/r/118639/diff/
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> Testing
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> Configuring virtual desktops does not crash anymore
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> Thanks,
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> Aurélien Gâteau
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>

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