[gtk] (4 commits) Non-fast-forward update to branch columnview-menu

[Matthias Clasen <matthiasc src gnome org>]

The branch 'columnview-menu' 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:

  b04ff07... columnviewcolumn: Add a menu property
  200c79e... columnviewtitle: Display a context menu
  f0da8d4... Add a header menu to settings demo
  e8ecdce... Add more columns to the settings demo

Commits added to the branch:

  f27bd06... columnviewcolumn: Add a menu property
  cb2901e... columnviewtitle: Display a context menu
  c835214... Add a header menu to settings demo
  d02c48f... Add more columns to the settings demo