Code review comment for lp:~vanvugt/compiz/fix-unredirect-flicker

Completing the paper trail:
It appears "it just works" because GLX is designed to draw the (unre)directed windows on top of the front buffer (whichever that is), after the swap:
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.47.4979

So that's why it mostly works already without flickering for a single monitor.

It seems the multi-monitor flickering is just a mistake in the compiz opengl plugin, which is redirecting unredirected windows repeatedly, prematurely.