[mutter] (4 commits) Non-fast-forward update to branch gbsneto/underscan

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

The branch 'gbsneto/underscan' 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:

  f60f387... output-xrandr: Support different values for underscan atom
  679d8cb... monitor-manager: store and use underscan border xrandr valu
  6b29863... monitor-manager: check for underscan setting validity upfro
  766b6f3... monitor-manager: only support underscan when mode allows it

Commits added to the branch:

  97c43cb... output-xrandr: Support different values for underscan atom
  7faf894... monitor-manager: store and use underscan border xrandr valu
  483c26a... monitor-manager: check for underscan setting validity upfro
  9709b93... monitor-manager: only support underscan when mode allows it