[gtk] (4 commits) Non-fast-forward update to branch file-filter2

[Matthias Clasen <matthiasc src gnome org>]

The branch 'file-filter2' 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:

  a77aa92... filefilter: Convert to a GtkFilter
  12fd60a... Stop using gtk_file_filter_filter
  ecd47fa... Drop gtk_file_filter_filter
  62205c8... docs: Cleanups for the file filter docs

Commits added to the branch:

  885da9e... filefilter: Convert to a GtkFilter
  7eca665... Stop using gtk_file_filter_filter
  05ed4a8... Drop gtk_file_filter_filter
  a4aae49... docs: Cleanups for the file filter docs