[gtk] (17 commits) Created branch wip/otte/undo

[Benjamin Otte <otte src gnome org>]

The branch 'wip/otte/undo' was created.

Summary of new commits:

  cb7756c... undo: Add skeleton of base classes
  fd9c18f... entry: Add undo stack support
  19a9c6a... entry: Add an undo action
  1306256... undo: Actually implement undo
  aa08f89... undostack: Implement redo
  8e8ee81... entry: Rework undo
  131583f... undostack: Add a simple function to print the undo stack
  0ce285d... entry: Don't merge undo commands with different cursors
  ec991f5... entry: Redo recording of undo
  d39f484... entry: Allow entry to decide to not record undo actions
  729e90f... undocommand: Add gtk_undo_command_should_merge() function
  fc17f25... undocommand: Add a timestamp property
  3b11dcf... undocommand: Don't merge commands that are too far apart
  716878c... undo: Turn describe() vfunc into "title" property
  76ab997... undoundocommand: Never merge
  afb661e... undo: Change semantics of gtk_undo_command_merge()
  21e0327... undo: Add a way to record multiple commands into one