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    Bug 
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    Resolution: Unresolved
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    P3: Somewhat important 
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    None
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    5.8
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    None
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    Tested on OS X 10.9 and Linux/XCB. I'll try to add mode toggle switches to the tabdialog example to see if the issue persists in 5.9 .
Toggling the QTabBar tab close buttons on and off again doesn't restore the tab width. Proper width is restored by toggling document mode on and off (or off and on; the issue is independent of mode).