we can reset the video region asynchronously.. avoid errors in video …

…encode, don't do the validation here

git-svn-id: https://xpra.org/svn/Xpra/trunk@13671 3bb7dfac-3a0b-4e04-842a-767bc560f471

src/xpra/server/window/window_video_source.py

@@ -1448,7 +1448,6 @@ def do_video_encode(self, encoding, image, options):
             Runs in the 'encode' thread.
         """
         x, y, w, h = image.get_geometry()[:4]
-        assert (x==0 and y==0) or self.video_subregion.rectangle, "invalid position: %s,%s" % (x,y)
         src_format = image.get_pixel_format()
         if self.pixel_format!=src_format:
             videolog.warn("image pixel format changed from %s to %s", self.pixel_format, src_format)