3 files changed, 32 insertions, 0 deletions
diff --git a/src/widgets/kernel/qtooltip.cpp b/src/widgets/kernel/qtooltip.cpp
index 2e6575c163..9d8b0062f5 100644
--- a/src/widgets/kernel/qtooltip.cpp
+++ b/src/widgets/kernel/qtooltip.cpp
@@ -41,6 +41,7 @@
 #endif
 
 #include <QtWidgets/private/qtwidgetsglobal_p.h>
+#include <QtWidgets/private/qlabel_p.h>
 
 #include <qapplication.h>
 #include <qdesktopwidget.h>
@@ -127,6 +128,7 @@ public:
     ~QTipLabel();
     static QTipLabel *instance;
 
+    void adjustTooltipScreen(const QPoint &pos);
     void updateSize(const QPoint &pos);
 
     bool eventFilter(QObject *, QEvent *) override;
@@ -222,6 +224,12 @@ void QTipLabel::reuseTip(const QString &text, int msecDisplayTime, const QPoint
 
 void  QTipLabel::updateSize(const QPoint &pos)
 {
+#ifndef Q_OS_WINRT
+    // ### The code below does not always work well on WinRT
+    // (e.g COIN fails an auto test - tst_QToolTip::qtbug64550_stylesheet - QTBUG-72652)
+    d_func()->setScreenForPoint(pos);
+#endif
+    // Ensure that we get correct sizeHints by placing this window on the right screen.
     QFontMetrics fm(font());
     QSize extra(1, 0);
     // Make it look good with the default ToolTip font on Mac, which has a small descent.
@@ -229,6 +237,7 @@ void  QTipLabel::updateSize(const QPoint &pos)
         ++extra.rheight();
     QSize sh = sizeHint();
     if (wordWrap()) {
+        // ### When the above WinRT code is fixed, windowhandle should be used to find the screen.
         QScreen *screen = QGuiApplication::screenAt(pos);
         if (!screen)
             screen = QGuiApplication::primaryScreen();
diff --git a/src/widgets/kernel/qwidget.cpp b/src/widgets/kernel/qwidget.cpp
index bcfae46155..2a94b25ec9 100644
--- a/src/widgets/kernel/qwidget.cpp
+++ b/src/widgets/kernel/qwidget.cpp
@@ -2571,6 +2571,27 @@ void QWidgetPrivate::createWinId()
     }
 }
 
+/*!
+\internal
+Ensures that the widget is set on the screen point is on. This is handy getting a correct
+size hint before a resize in e.g QMenu and QToolTip
+*/
+
+void QWidgetPrivate::setScreenForPoint(const QPoint &pos)
+{
+    Q_Q(QWidget);
+    if (!q->isWindow())
+        return;
+    // Find the screen for pos and make the widget undertand it is on that screen.
+    const QScreen *currentScreen = windowHandle() ? windowHandle()->screen() : nullptr;
+    QScreen *actualScreen = QGuiApplication::screenAt(pos);
+    if (actualScreen && currentScreen != actualScreen) {
+        if (!windowHandle()) // Try to create a window handle if not created.
+            createWinId();
+        if (windowHandle())
+            windowHandle()->setScreen(actualScreen);
+    }
+}
 
 /*!
 \internal
diff --git a/src/widgets/kernel/qwidget_p.h b/src/widgets/kernel/qwidget_p.h
index be45c4c868..6f1ce67c4c 100644
--- a/src/widgets/kernel/qwidget_p.h
+++ b/src/widgets/kernel/qwidget_p.h
@@ -355,6 +355,8 @@ public:
     void createRecursively();
     void createWinId();
 
+    void setScreenForPoint(const QPoint &pos);
+
     void createTLExtra();
     void createExtra();
     void deleteExtra();