Manually disable qt auto scale factor

Reviewed-by: Kai Uwe Broulik

startkde/startkde.cmake

@@ -145,6 +145,10 @@ fi
 if [ "$kdeglobals_kscreen_screenscalefactors" ]; then
     export QT_SCREEN_SCALE_FACTORS="$kdeglobals_kscreen_screenscalefactors"
 fi
+#Manually disable auto scaling because we are scaling above
+#otherwise apps that manually opt in for high DPI get auto scaled by the developer AND manually scaled by us
+export QT_AUTO_SCREEN_SCALE_FACTOR=0
+
 
 # XCursor mouse theme needs to be applied here to work even for kded or ksmserver
 if test -n "$kcminputrc_mouse_cursortheme" -o -n "$kcminputrc_mouse_cursorsize" ; then