1 files changed, 9 insertions, 2 deletions

diff --git a/src/widgets/widgets/qmenubar.cpp b/src/widgets/widgets/qmenubar.cpp
index 1ffe82835d..c9c9191c17 100644
--- a/src/widgets/widgets/qmenubar.cpp
+++ b/src/widgets/widgets/qmenubar.cpp
@@ -286,16 +286,23 @@ void QMenuBarPrivate::popupAction(QAction *action, bool activateFirst)
         activeMenuPriv->causedPopup.action = action;
 
         QRect adjustedActionRect = actionRect(action);
-        QPoint pos(q->mapToGlobal(QPoint(adjustedActionRect.left(), adjustedActionRect.bottom() + 1)));
+        QPoint popupPos = adjustedActionRect.bottomLeft() + QPoint(0, 1);
+
         //we put the popup menu on the screen containing the bottom-center of the action rect
         QScreen *menubarScreen = q->window()->windowHandle()->screen();
-        QPointer<QScreen> popupScreen = menubarScreen->virtualSiblingAt(pos + QPoint(adjustedActionRect.width() / 2, 0));
+        QPoint screenTestPos = q->mapToGlobal(popupPos + QPoint(adjustedActionRect.width() / 2, 0));
+        QPointer<QScreen> popupScreen = menubarScreen->virtualSiblingAt(screenTestPos);
         if (!popupScreen)
             popupScreen = menubarScreen;
         std::swap(popupScreen, activeMenuPriv->popupScreen);
         const QSize popup_size = activeMenu->sizeHint();
         std::swap(popupScreen, activeMenuPriv->popupScreen);
 
+        // Use screenTestPos.y() for the popup y position. This is the correct global y
+        // consistent with the selected screen in cases where the action rect spans
+        // multiple screens with different scale factors.
+        QPoint pos(q->mapToGlobal(popupPos).x(), screenTestPos.y());
+
         QRect screenRect = popupScreen->geometry();
         pos = QPoint(qMax(pos.x(), screenRect.x()), qMax(pos.y(), screenRect.y()));
         const bool fitUp = (pos.y() - popup_size.height() >= screenRect.top());