[mutter] (10 commits) Non-fast-forward update to branch wip/carlosg/clip-me-harder

[Carlos Garnacho <carlosg src gnome org>]

The branch 'wip/carlosg/clip-me-harder' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  c98d57f... compositor: Optimize shadows entirely if clip region is emp
  a6f7c85... compositor: Check frame bounds region before use
  b37fbf8... compositor: Fix check to clip beneath the window
  b6410c4... compositor: Cull out areas covered by opaque windows
  53eca1c... compositor: Clip obscured background areas

Commits added to the branch:

  aee8bfc... core: Only notify on MetaWindow::user-time on actual change (*)
  09bab98... core: Avoid consecutive workspace changes in window constru (*)
  35007eb... Update Friulian translation (*)
  ddbdb5f... clutter: Use g_object_notify_by_pspec() (*)
  2812338... shadow-factory: Optimize shadows entirely if clip region is
  0f6ab78... window-actor: Check frame bounds region before use
  cc59681... window-actor: Fix check to clip beneath the window
  ac7aa11... window-actor: Cull out areas covered by opaque windows
  90a5582... background-actor: Clip obscured background areas
  f501fdc... window-actor: Remove negation in function name

(*) This commit already existed in another branch; no separate mail sent