clutter: Only redraw affected portions on parent widget on show/hide

If we are lucky enough and the parent actor has the CLUTTER_ACTOR_NO_LAYOUT
flag, we would skip the relayout, but still redraw the parent actor in its
entirety.

In these cases, we can at least just redraw the area affected by the actor
being shown/hidden.
2 jobs for wip/carlosg/avoid-parent-relayouts in 4 minutes and 52 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #161941
build-mutter

00:02:09

 
  Test
passed #161942
test-mutter

00:02:43