[gtk+] (16 commits) Created branch treeview-refactor-staging

[Tristan Van Berkom <tvb src gnome org>]

The branch 'treeview-refactor-staging' was created.

Summary of new commits:

  acc4dd2... Added GtkTreeViewColumn:cell-area construct-only property.
  0f4a2d3... Fixed merge conflicts from cherry-pick of construct-only Gt
  c8c5ed8... Removing hack and fixing gtk_tree_view_column_cell_get_size
  5984310... Removed all variables from GtkTreeViewColumn and created Gt
  01633c8... Removed the private sharing of internal treeview macros fro
  4afeb87... Removed GtkTreeViewPrivate from gtktreeprivate.h and added 
  8a51db2... Changed _gtk_tree_view_column_set_width for _gtk_tree_view_
  cca89dc... Use gtk_tree_view_get_real_requested_width_from_column() al
  1d8d93b... Created _gtk_tree_view_column_request_width().
  d2dab5c... Allocate proper inner cell area to the GtkTreeViewColumn.
  20152d4... Changed GtkTreeView to bookkeep the deepest expanded depth 
  a07fb8c... Fixed GtkTreeViewColumn allocation to only subtract the dep
  36e0c75... Added GtkTreeViewColumn:cell-area construct-only property.
  2e77196... Removing hack and fixing gtk_tree_view_column_cell_get_size
  a97425b... Adding testverticalcells.c.
  f6c8565... Fixed conflicts from rebasing GtkTreeViewColumn changes fro