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

[Thomas Lübking]

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https://git.reviewboard.kde.org/r/116712/#review52665
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tried passing "this" as context?

QMetaObject::Connection QObject::connect(const QObject * sender, PointerToMemberFunction signal, const QObject * context, Functor functor, Qt::ConnectionType type) [static]
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Creates a connection of a given type from signal in sender object to functor to be placed in a specific event loop of context, and returns a handle to the connection
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The connection will automatically disconnect if the sender or the context is destroyed.

- Thomas Lübking


On March 11, 2014, 1:26 p.m., Martin Gräßlin wrote:
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> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/116712/
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> 
> (Updated March 11, 2014, 1:26 p.m.)
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> Review request for kwin, Plasma and Sebastian Kügler.
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> Repository: kde-workspace
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> Description
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> [kwin] Disconnect lambda connection on destroy of slide effect
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> 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.
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> 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.
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> 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.
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> --
> Plasma and sebas are only added to highlight this GOTCHA!
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> Diffs
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>   kwin/effects/slide/slide.cpp e6a8d588fe6ef7c7cb2981b0d49bf2c670753e2d 
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> Diff: https://git.reviewboard.kde.org/r/116712/diff/
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> Testing
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> Thanks,
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> Martin Gräßlin
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>

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