[gtk] (6 commits) Non-fast-forward update to branch matthiasc/for-master

[Matthias Clasen <matthiasc src gnome org>]

The branch 'matthiasc/for-master' 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:

  5cdfb63... viewport: Drop shadow-type
  f6edd04... Drop GtkShadowType
  11f7a8a... button: Drop relief
  f84dfe9... menubutton: Drop relief
  ce9b773... Drop GtkReliefStyle
  bb1d73a... calendar: Fix focus keynav

Commits added to the branch:

  e1e384c... viewport: Drop shadow-type
  29a710f... Drop GtkShadowType
  d07dfec... button: Drop relief
  4e2bb39... menubutton: Drop relief
  9217b6c... Drop GtkReliefStyle
  b186612... calendar: Fix focus keynav