[gtk] (5 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:

  45c1931... columnviewcolumn: Add a menu property
  17cb151... columnviewtitle: Display a context menu
  08a1b90... Add a header menu to settings demo
  77be8bf... Add more columns to the settings demo

Commits added to the branch:

  9d15e64... gtk-demo: Plug a leak (*)
  f6b873c... columnviewcolumn: Add a menu property
  f1103c1... columnviewtitle: Display a context menu
  0fe8782... Add a header menu to settings demo
  8d63789... Add more columns to the settings demo

(*) This commit already existed in another branch; no separate mail sent