Comment 10 for bug 449422

thanks a lot for the video !
indeed it seems different, the "flash" occurs on the left side, whereas in the other bugs it appears on the top left corner.
more than a flash, it seems that the background is not drawn at the correct position for a tiny instant.
do you have the option to make the decoration follow the mouse ? if so, could you please try with static decoratoins ?
also, does it happen with opengl or cairo backend ?