[KDE/Mac] Review Request 126186: more sensible workaround for code review crash on OS X

[René J.V. Bertin]

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https://git.reviewboard.kde.org/r/126186/
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Review request for KDE Software on Mac OS X and KDevelop.


Repository: kdevplatform


Description
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This patch moves the workaround from RR #120081 (commits 1f111414 and 4d2a009c) by calling `setPatch(0)` in the `PatchReviewPlugin` dtor, and using `m_patch->deleteLater()` in `setPatch()` (a change which should probably have been committed).
As a result, the `notifyChange` slot needs a nullptr check, which can then also be used to stop the update timer.


Diffs
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  plugins/patchreview/patchreview.cpp ad576c2 

Diff: https://git.reviewboard.kde.org/r/126186/diff/


Testing
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On OS X 10.9.5 with KDELibs 4.14.14 and KDevelop 4.7.2 (git/head).


Thanks,

René J.V. Bertin

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