[gtk+] (7 commits) ...Merge branch 'places-sidebar'

[Federico Mena Quintero <federico src gnome org>]

Summary of changes:

  7d52dff... Add a DropState enum to the internal state of the sidebar (*)
  624b352... Move the drop feedback code to stub functions (*)
  bc0a9a3... Add a temporary row for feedback when inserting a bookmark  (*)
  3815f5d... Dropping on the feedback row is always possible (*)
  a1b9bf7... Adjust the drag destination row when it is above the curren (*)
  2db8e25... treeview: Use equal areas in the computation of drag dest r (*)
  cab1d67... Merge branch 'places-sidebar'

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