QupZilla/qupzilla — pull request #619 by ff2000 (2012-10-24 16:38:23+00:00)
Title: remove CloseButton::hideEvent()

That causes crashes when entering/leaving fullscreen mode when the tabbar has non-closable tabs.
deleteLater() in the hideEvent left a dangling pointer in the corresponding QTabBarPrivate::Tab.
The next re-layout of the tabs caused the crash when querying the size of the deleted closeButton:

bt
https://gist.github.com/3947208

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