[gtk] (8 commits) Non-fast-forward update to branch wip/chergert/textundo

[Christian Hergert <chergert src gnome org>]

The branch 'wip/chergert/textundo' 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:

  c28e0ff... textview: add undo/redo support to GtkTextView
  62c6ce1... entrybuffer: remove text in ::deleted-text default handler
  3df14a6... text: add undo support to GtkText
  80dd67a... entry: allow disabling undo for GtkEntry
  7cf1a19... gtk-demo: wrap text operations in irreversible actions
  dee14c3... gtk-demo: add an undo demo for GtkEntry
  1664338... gtk-demo: add a demo for TextView undo/redo
  b953892... gtk-demo: set irreversable actions for textview demos

Commits added to the branch:

  b470ac8... textview: add undo/redo support to GtkTextView
  211c115... entrybuffer: remove text in ::deleted-text default handler
  289365d... text: add undo support to GtkText
  9ba2921... entry: allow disabling undo for GtkEntry
  1c4b0e3... gtk-demo: wrap text operations in irreversible actions
  0579f7b... gtk-demo: add an undo demo for GtkEntry
  02a5947... gtk-demo: add a demo for TextView undo/redo
  d29c209... gtk-demo: set irreversable actions for textview demos