actually use the pixel count to choose a full window update

git-svn-id: https://xpra.org/svn/Xpra/trunk@8313 3bb7dfac-3a0b-4e04-842a-767bc560f471

src/xpra/server/window_source.py

@@ -1071,7 +1071,7 @@ def send_full_window_update():
             pixel_count = sum(rect.width*rect.height for rect in regions)
             log("send_delayed_regions: %s regions with %s pixels (coding=%s)", len(regions), pixel_count, coding)
             actual_encoding = get_encoding(pixel_count)
-            if self.must_encode_full_frame(window, actual_encoding):
+            if pixel_count>=ww*wh or self.must_encode_full_frame(window, actual_encoding):
                 #use full screen dimensions:
                 self.process_damage_region(damage_time, window, 0, 0, ww, wh, actual_encoding, options)
                 return