[gtk] (6 commits) Non-fast-forward update to branch prop-list

[Matthias Clasen <matthiasc src gnome org>]

The branch 'prop-list' 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:

  09f2166... wip: rubberband drawing
  8f1c824... Add a selection model test
  711de09... columnviewcolumn: Add a menu model
  fe4ad63... columnviewtitle: Display a context menu

Commits added to the branch:

  4e27ec8... Add a selection model test
  4a84d14... columnviewcolumn: Add a menu model
  82787ba... columnviewtitle: Display a context menu
  01a27f8... Add GtkMultiSelection
  1bb5b18... listbase: Add rubberband selection
  70d1634... gtk-demo: Make colors demo use rubberbanding