[nautilus] (3 commits) Non-fast-forward update to branch wip/antoniof/make-window-slot-final

[António Fernandes <antoniof src gnome org>]

The branch 'wip/antoniof/make-window-slot-final' 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:

  72acb6b... window-slot: Make back_or_forward() a slot method
  2b8ede3... window-slot: Use view id macros as action values
  0002f2b... view: Streamline view ids enumeration
  f3843e7... files-view: Make override method private

Commits added to the branch:

  ba93a0d... window-slot: Make back_or_forward() a slot method
  e35233b... view: Use view id macros instead of enum
  c00b71c... files-view: Make override method private