Cocoa: Make High DPI drag cursor work

Change-Id: Ide4bc50ab7173529a00fe60a04204bad0b3f275e
Task-id: QTBUG-60769
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

src/plugins/platforms/cocoa/qnsview.mm

@@ -2068,6 +2068,7 @@ static QPoint mapWindowCoordinates(QWindow *source, QWindow *target, QPoint poin
     }
     else {
         NSImage *nsimage = qt_mac_create_nsimage(pixmapCursor);
+        nsimage.size = NSSizeFromCGSize((pixmapCursor.size() / pixmapCursor.devicePixelRatioF()).toCGSize());
         nativeCursor = [[NSCursor alloc] initWithImage:nsimage hotSpot:NSZeroPoint];
         [nsimage release];
     }