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QTabWidget: Guard QTabBar in documentMode

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While QTabBar is created by the QTabWidget and therefore doesn't
need to be guarded, QTabBarPrivate::init calls QStyle::styleHint
which might result in QStyleSheetStyle querying properties on
the QTabWidget while its QTabBar isn't assigned yet.

Pick-to: 6.9 6.8 6.5
Change-Id: Ic832d3253c5dc54d8d718760c63f34f0b8bde000
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>
This commit is contained in:
Kai Uwe Broulik 2025-03-10 12:00:46 +01:00
parent f9a625eb8c
commit 61c2d3f101
2 changed files with 15 additions and 1 deletions
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3
src/widgets/widgets/qtabwidget.cpp
View File

@ -1361,7 +1361,8 @@ void QTabWidget::setUsesScrollButtons(bool useButtons)
bool QTabWidget::documentMode() const
{
Q_D(const QTabWidget);
return d->tabs->documentMode();
// QStyleSheetStyle could query documentMode during creation of our QTabBar.
return d->tabs ? d->tabs->documentMode() : false;
}
void QTabWidget::setDocumentMode(bool enabled)

13
tests/auto/widgets/styles/qstylesheetstyle/tst_qstylesheetstyle.cpp
View File

@ -20,6 +20,8 @@
#include <QtWidgets/QSplitter>
#include <QtWidgets/QStyle>
#include <QtWidgets/QStyleFactory>
#include <QtWidgets/QTabBar>
#include <QtWidgets/QTabWidget>
#include <QtWidgets/QTableWidget>
#include <QtWidgets/QToolButton>
#include <QtWidgets/QToolTip>
@ -115,6 +117,7 @@ private slots:
void appStyle();
void QTBUG11658_cachecrash();
void styleSheetTargetAttribute();
void tabWidgetDocumentModeCrash();
void unpolish();
void highdpiImages_data();
@ -2331,6 +2334,16 @@ void tst_QStyleSheetStyle::styleSheetTargetAttribute()
QCOMPARE(pb.testAttribute(Qt::WA_StyleSheetTarget), false);
}
void tst_QStyleSheetStyle::tabWidgetDocumentModeCrash()
{
// Don't crash when matching accessing documentMode of QTabWidget while styling QTabBar.
qApp->setStyleSheet("QTabWidget[documentMode=true] QTabBar { font-size: 40pt; }");
QTabWidget tabWidget;
tabWidget.setDocumentMode(true);
QCOMPARE(FONTSIZE(*tabWidget.tabBar()), 40);
}
void tst_QStyleSheetStyle::unpolish()
{
QWidget w;