Code review comment for lp://qastaging/~smspillaz/compiz-core/compiz-core.work_923683

REGRESSION:
When resizing a window's top or left edges, the opposite edge jitters about (in Normal resize move). I know I mentioned this bug yesterday but I only just realized it's a regression that's unique to this branch.

Sounds like that's the cause of the resize artefacts too. So if we fix the regression then we can remove the damageScreen workaround from the resize plugin.