3 files changed, 5 insertions, 1 deletions
diff --git a/src/plugins/platforms/cocoa/qcocoawindow.h b/src/plugins/platforms/cocoa/qcocoawindow.h
index 7a01835d5b..bb5c0c1974 100644
--- a/src/plugins/platforms/cocoa/qcocoawindow.h
+++ b/src/plugins/platforms/cocoa/qcocoawindow.h
@@ -272,6 +272,7 @@ public: // for QNSView
     bool m_geometryUpdateExposeAllowed;
     bool m_isExposed;
     QRect m_exposedGeometry;
+    qreal m_exposedDevicePixelRatio;
     int m_registerTouchCount;
     bool m_resizableTransientParent;
     bool m_hiddenByClipping;
diff --git a/src/plugins/platforms/cocoa/qcocoawindow.mm b/src/plugins/platforms/cocoa/qcocoawindow.mm
index 5a4ac9b2cc..5def64ee0a 100644
--- a/src/plugins/platforms/cocoa/qcocoawindow.mm
+++ b/src/plugins/platforms/cocoa/qcocoawindow.mm
@@ -1710,6 +1710,7 @@ void QCocoaWindow::exposeWindow()
     if (!m_isExposed) {
         m_isExposed = true;
         m_exposedGeometry = geometry();
+        m_exposedDevicePixelRatio = devicePixelRatio();
         QWindowSystemInterface::handleExposeEvent(window(), QRegion(geometry()));
     }
 }
@@ -1735,11 +1736,12 @@ void QCocoaWindow::updateExposedGeometry()
     if (!isWindowExposable())
         return;
 
-    if (m_exposedGeometry == geometry())
+    if (m_exposedGeometry == geometry() && m_exposedDevicePixelRatio == devicePixelRatio())
         return;
 
     m_isExposed = true;
     m_exposedGeometry = geometry();
+    m_exposedDevicePixelRatio = devicePixelRatio();
     QWindowSystemInterface::handleExposeEvent(window(), QRegion(geometry()));
 }
 
diff --git a/src/plugins/platforms/cocoa/qnsview.mm b/src/plugins/platforms/cocoa/qnsview.mm
index 83a1f08973..0b9683a3ef 100644
--- a/src/plugins/platforms/cocoa/qnsview.mm
+++ b/src/plugins/platforms/cocoa/qnsview.mm
@@ -329,6 +329,7 @@ static QTouchDevice *touchDevice = 0;
         if (m_window) {
             NSUInteger screenIndex = [[NSScreen screens] indexOfObject:self.window.screen];
             if (screenIndex != NSNotFound) {
+                m_platformWindow->updateExposedGeometry();
                 QCocoaScreen *cocoaScreen = QCocoaIntegration::instance()->screenAtIndex(screenIndex);
                 QWindowSystemInterface::handleWindowScreenChanged(m_window, cocoaScreen->screen());
             }