Windows QPA: Apply scaling when fixing maximized/frameless geometry.

Task-number: QTBUG-8361
Task-number: QTBUG-51327
Change-Id: I590702df8f6313701fe69d0873657c6af53fee16
Reviewed-by: Andy Shaw <andy.shaw@theqtcompany.com>

1 files changed, 5 insertions, 4 deletions

diff --git a/src/plugins/platforms/windows/qwindowswindow.cpp b/src/plugins/platforms/windows/qwindowswindow.cpp
index e2f5885047..c0892feabe 100644
--- a/src/plugins/platforms/windows/qwindowswindow.cpp
+++ b/src/plugins/platforms/windows/qwindowswindow.cpp
@@ -2089,14 +2089,15 @@ void QWindowsWindow::getSizeHints(MINMAXINFO *mmi) const
 
         // Documentation of MINMAXINFO states that it will only work for the primary screen
         if (screen && screen == QGuiApplication::primaryScreen()) {
-            mmi->ptMaxSize.y = screen->availableGeometry().height();
+            const QRect availableGeometry = QHighDpi::toNativePixels(screen->availableGeometry(), screen);
+            mmi->ptMaxSize.y = availableGeometry.height();
 
             // Width, because you can have the taskbar on the sides too.
-            mmi->ptMaxSize.x = screen->availableGeometry().width();
+            mmi->ptMaxSize.x = availableGeometry.width();
 
             // If you have the taskbar on top, or on the left you don't want it at (0,0):
-            mmi->ptMaxPosition.x = screen->availableGeometry().x();
-            mmi->ptMaxPosition.y = screen->availableGeometry().y();
+            mmi->ptMaxPosition.x = availableGeometry.x();
+            mmi->ptMaxPosition.y = availableGeometry.y();
         } else if (!screen){
             qWarning() << "window()->screen() returned a null screen";
         }