Review Request 116712: [kwin] Disconnect lambda connection on destroy of slide effect

[Martin Gräßlin]

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https://git.reviewboard.kde.org/r/116712/
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Review request for kwin, Plasma and Sebastian Kügler.


Repository: kde-workspace


Description
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[kwin] Disconnect lambda connection on destroy of slide effect

Lambda connections are tricky: they do not get automatically
disconnected when the captured [this] gets destroyed, but they get
disconnected when the sender object gets destroyed.

Thus the slide effect was crashing if it got disabled and a window
got deleted, because the connection was still present and tried to
access the destroyed this pointer.

To circumvent we need to store the QMetaObject::Connection and
disconnect when the SlideEffect gets destroyed. To not clutter the
private variables it's using another lambda.

--
Plasma and sebas are only added to highlight this GOTCHA!


Diffs
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  kwin/effects/slide/slide.cpp e6a8d588fe6ef7c7cb2981b0d49bf2c670753e2d 

Diff: https://git.reviewboard.kde.org/r/116712/diff/


Testing
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Thanks,

Martin Gräßlin

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