1 files changed, 6 insertions, 1 deletions
diff --git a/src/gui/kernel/qplatformintegration.cpp b/src/gui/kernel/qplatformintegration.cpp
index 7d1fcd4eeb..bb20a160db 100644
--- a/src/gui/kernel/qplatformintegration.cpp
+++ b/src/gui/kernel/qplatformintegration.cpp
@@ -482,6 +482,9 @@ void QPlatformIntegration::screenAdded(QPlatformScreen *ps, bool isPrimary)
     } else {
         QGuiApplicationPrivate::screen_list.append(screen);
     }
+
+    QGuiApplicationPrivate::resetCachedDevicePixelRatio();
+
     emit qGuiApp->screenAdded(screen);
 
     if (isPrimary)
@@ -499,6 +502,8 @@ void QPlatformIntegration::removeScreen(QScreen *screen)
     const bool wasPrimary = (!QGuiApplicationPrivate::screen_list.isEmpty() && QGuiApplicationPrivate::screen_list.at(0) == screen);
     QGuiApplicationPrivate::screen_list.removeOne(screen);
 
+    QGuiApplicationPrivate::resetCachedDevicePixelRatio();
+
     if (wasPrimary && qGuiApp && !QGuiApplicationPrivate::screen_list.isEmpty())
         emit qGuiApp->primaryScreenChanged(QGuiApplicationPrivate::screen_list.at(0));
 }
@@ -534,7 +539,7 @@ void QPlatformIntegration::setPrimaryScreen(QPlatformScreen *newPrimary)
     if (idx == 0)
         return;
 
-    QGuiApplicationPrivate::screen_list.swap(0, idx);
+    QGuiApplicationPrivate::screen_list.swapItemsAt(0, idx);
     emit qGuiApp->primaryScreenChanged(newPrimaryScreen);
 }