Code review comment for lp:~cimi/overlay-scrollbar/fix-compiz-stacking

> What's currently used in trunk in order to do that and what's the problem?
nothing is used in trunk: the issue is that, if your window is not the focused one (something above it), and you make the thumb appear, the thumb will be above everything.
we need to restack the thumb window so it will be on the same layer of its toplevel