[KDE/Mac] Review Request 120529: [OS X] avoid crash when calling invalidateBuffer_resizeHelper on parentless widget

[René J.V. Bertin]

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https://git.reviewboard.kde.org/r/120529/
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Review request for KDE Software on Mac OS X and Qt KDE.


Repository: qt


Description
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Prevents a crash in `invalidateBuffer_resizeHelper` when calling the stock `KMenu::addTitle` on OS X.
See https://bugreports.qt-project.org/browse/QTBUG-41716 and https://codereview.qt-project.org/#/c/96486/


Diffs
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  src/gui/kernel/qwidget_mac.mm 7e9ebb9 

Diff: https://git.reviewboard.kde.org/r/120529/diff/


Testing
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With Qt 4.8.6 from MacPorts on OS X 10.6.8 and 10.9.4 .


Thanks,

René J.V. Bertin

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