[metacity] (10 commits) Created branch wip/test-3-20

[Alberts Muktupāvels <muktupavels src gnome org>]

The branch 'wip/test-3-20' was created.

Summary of new commits:

  003e470... window: use the correct frame size during unmaximize
  4b1a0d5... window: clear the frame borders before calculating the unfu
  39cc2c7... compositor: rename border_size to frame_region
  9718534... compositor: add client_region
  dc3bfe6... compositor: use correct xid when removing window
  8997488... compositor: add window mask
  fb0fe9c... frame: always use the client window's visual
  284150e... compositor: use window mask
  a4eb7c3... require composite extensions at build-time
  65778e8... configure: minor cleanup