Details
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Bug
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Resolution: Done
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P1: Critical
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6.3.0
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None
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Windows
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ac80cee846 (qt/qtbase/dev) ac80cee846 (qt/tqtc-qtbase/dev) 3a542c57ed (qt/qtbase/6.3) 3a542c57ed (qt/tqtc-qtbase/6.3) 9b68302e2c (qt/tqtc-qtbase/6.2) dabd025173 (qt/qtbase/6.4) dabd025173 (qt/tqtc-qtbase/6.4)
Description
If a QTabWidget contains some tab that was hidden using setTabVisible(index, false) and I close the last (visible, of course) tab, the app will crash.
The crash is caused by QTabBar's d->lastVisible being -1 which causes the qBound() on line 1085 (Qt 6.3.0) to fail an assert check:
// in QTabBar::removeTab(int index): case SelectRightTab: newIndex = qBound(d->firstVisible, index, d->lastVisible); // <<< ASSERT FAILS break;
To reproduce it using the attached sample app:
- press the "hide current tab" button
- close all tabs using the close button on the tabs
- it should fail when the last tab is closed (but will worked fine on my Qt 5.15.2 build)
In my tests it didn't matter which tab got hidden and in what order I closed them.
Full error message:
ASSERT: "!(max < min)" in file C:\Users\qt\work\qt\qtbase\include\QtCore\../../src/corelib/global/qglobal.h, line 1025
Call stack:
1 qt_message_fatal qlogging.cpp 1872 0x7ff82b984cf4 2 QMessageLogger::fatal qlogging.cpp 882 0x7ff82b983198 3 qt_assert qglobal.cpp 3304 0x7ff82b9700d9 4 qBound<int> qglobal.h 1026 0x7ff82c806b40 5 QTabBar::removeTab qtabbar.cpp 1085 0x7ff82ccd85e7 6 QtPrivate::FunctorCall<QtPrivate::IndexesList<0>,QtPrivate::List<int>,void,void (__cdecl QTabBar:: *)(int)>::call qobjectdefs_impl.h 171 0x7ff7350b36aa 7 QtPrivate::FunctionPointer<void (__cdecl QTabBar:: *)(int)>::call<QtPrivate::List<int>,void> qobjectdefs_impl.h 209 0x7ff7350b2cad 8 QtPrivate::QSlotObject<void (__cdecl QTabBar:: *)(int),QtPrivate::List<int>,void>::impl qobjectdefs_impl.h 420 0x7ff7350b3793 9 QtPrivate::QSlotObjectBase::call qobjectdefs_impl.h 399 0x7ff82baa8ce3 10 doActivate<0> qobject.cpp 3919 0x7ff82bb4d038 11 QMetaObject::activate qobject.cpp 3980 0x7ff82bb34a48 12 QTabBar::tabCloseRequested moc_qtabbar.cpp 325 0x7ff82ccdb559 13 QTabBarPrivate::_q_closeTab qtabbar.cpp 820 0x7ff82cce05d0 14 QTabBar::qt_static_metacall moc_qtabbar.cpp 173 0x7ff82ccd7256 15 doActivate<0> qobject.cpp 3934 0x7ff82bb4d16a 16 QMetaObject::activate qobject.cpp 3980 0x7ff82bb34a48 17 QAbstractButton::clicked moc_qabstractbutton.cpp 288 0x7ff82cae30d9 18 QAbstractButtonPrivate::emitClicked qabstractbutton.cpp 416 0x7ff82cae55f7 19 QAbstractButtonPrivate::click qabstractbutton.cpp 408 0x7ff82cae440e 20 QAbstractButton::mouseReleaseEvent qabstractbutton.cpp 1012 0x7ff82cae3966 ... <More>