2 files changed, 15 insertions, 4 deletions
diff --git a/src/plugins/styles/modernwindows/qwindows11style.cpp b/src/plugins/styles/modernwindows/qwindows11style.cpp
index a79aac76ef..daca801609 100644
--- a/src/plugins/styles/modernwindows/qwindows11style.cpp
+++ b/src/plugins/styles/modernwindows/qwindows11style.cpp
@@ -2020,11 +2020,11 @@ void QWindows11Style::polish(QWidget* widget)
         widget->setPalette(pal);
     } else if (const auto *scrollarea = qobject_cast<QAbstractScrollArea *>(widget);
                scrollarea && !qobject_cast<QMdiArea *>(widget)) {
-        QPalette pal = widget->palette();
-        QColor backgroundColor = widget->palette().base().color();
-        backgroundColor.setAlpha(255);
-        pal.setColor(scrollarea->viewport()->backgroundRole(), backgroundColor);
+        QPalette pal = scrollarea->viewport()->palette();
+        const QPalette originalPalette = pal;
+        pal.setColor(scrollarea->viewport()->backgroundRole(), Qt::transparent);
         scrollarea->viewport()->setPalette(pal);
+        scrollarea->viewport()->setProperty("_q_original_background_palette", originalPalette);
     } else if (qobject_cast<QCommandLinkButton *>(widget)) {
         widget->setProperty("_qt_usingVistaStyle",false);
         QPalette pal = widget->palette();
@@ -2034,6 +2034,16 @@ void QWindows11Style::polish(QWidget* widget)
     }
 }
 
+void QWindows11Style::unpolish(QWidget *widget)
+{
+    QWindowsVistaStyle::unpolish(widget);
+    if (const auto *scrollarea = qobject_cast<QAbstractScrollArea *>(widget);
+        scrollarea && !qobject_cast<QMdiArea *>(widget)) {
+        const QPalette pal = scrollarea->viewport()->property("_q_original_background_palette").value<QPalette>();
+        scrollarea->viewport()->setPalette(pal);
+        scrollarea->viewport()->setProperty("_q_original_background_palette", QVariant());
+    }
+}
 
 /*
 The colors for Windows 11 are taken from the official WinUI3 Figma style at
diff --git a/src/plugins/styles/modernwindows/qwindows11style_p.h b/src/plugins/styles/modernwindows/qwindows11style_p.h
index 90e368f1ea..9c54afd967 100644
--- a/src/plugins/styles/modernwindows/qwindows11style_p.h
+++ b/src/plugins/styles/modernwindows/qwindows11style_p.h
@@ -48,6 +48,7 @@ public:
     int pixelMetric(PixelMetric metric, const QStyleOption *option = nullptr,
                     const QWidget *widget = nullptr) const override;
     void polish(QPalette &pal) override;
+    void unpolish(QWidget *widget) override;
 protected:
     QWindows11Style(QWindows11StylePrivate &dd);
 private: