Code review comment for lp:~vanvugt/compiz/XDamageReport2

In that case, the maintenance risk is actually between:
   XDamageCreate(..., XDamageReportBoundingBox);
and
   XDamageSubtract().

So to mitigate that risk, we need to ensure:
   1. All plugins that use XDamageCreate with BoundingBox need to depend on composite. Already done.
   2. Maybe add a comment to composite saying "Don't delete this code!". But the same could be said for lots of critical code.

If you happen to delete the XDamageSubtract code by accident, then I can tell you from experience that you'll know about it because the screen won't update at all. :)