1 files changed, 46 insertions, 0 deletions
diff --git a/tests/auto/widgets/widgets/qcombobox/tst_qcombobox.cpp b/tests/auto/widgets/widgets/qcombobox/tst_qcombobox.cpp
index d8bb34933a..32437050f5 100644
--- a/tests/auto/widgets/widgets/qcombobox/tst_qcombobox.cpp
+++ b/tests/auto/widgets/widgets/qcombobox/tst_qcombobox.cpp
@@ -167,6 +167,7 @@ private slots:
     void task_QTBUG_52027_mapCompleterIndex();
     void checkMenuItemPosWhenStyleSheetIsSet();
     void checkEmbeddedLineEditWhenStyleSheetIsSet();
+    void propagateStyleChanges();
 
 private:
     PlatformInputContext m_platformInputContext;
@@ -3586,5 +3587,50 @@ void tst_QComboBox::checkEmbeddedLineEditWhenStyleSheetIsSet()
     qApp->setStyleSheet(oldCss);
 }
 
+/*!
+    Tests that the style-based frame style propagates to the internal container
+    widget of QComboBox when the style changes by verifying that the respective
+    styleHint is asked for when the style changes.
+
+    See QTBUG-92488
+*/
+void tst_QComboBox::propagateStyleChanges()
+{
+    class FrameStyle : public QProxyStyle
+    {
+    public:
+        FrameStyle(int frameStyle, QStyle *style = nullptr)
+            : QProxyStyle(style), frameStyle(frameStyle)
+        {}
+
+        int styleHint(QStyle::StyleHint hint, const QStyleOption *opt,
+                      const QWidget *widget, QStyleHintReturn *returnData) const
+        {
+            if (hint == QStyle::SH_ComboBox_PopupFrameStyle) {
+                inquired = true;
+                return frameStyle;
+            }
+            return QProxyStyle::styleHint(hint, opt, widget, returnData);
+        }
+
+        int frameStyle;
+        mutable bool inquired = false;
+    };
+
+    FrameStyle framelessStyle(QFrame::NoFrame);
+    FrameStyle frameStyle(QFrame::Plain | QFrame::Sunken);
+
+    QComboBox combo;
+    // container will be created and take settings from this style
+    combo.setStyle(&framelessStyle);
+    QVERIFY(framelessStyle.inquired);
+    combo.addItem(QLatin1String("Open"));
+    combo.addItem(QLatin1String("Close"));
+    // needed because of QComboBox's adjustSizeTimer not doing anything otherwise
+    combo.setSizeAdjustPolicy(QComboBox::AdjustToContents);
+    combo.setStyle(&frameStyle);
+    QVERIFY(frameStyle.inquired);
+}
+
 QTEST_MAIN(tst_QComboBox)
 #include "tst_qcombobox.moc"