[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:

  c4263e2... editable: add enable-undo property
  c3efb84... entrybuffer: remove text in ::deleted-text default handler
  ea4e44a... text: add undo support to GtkText
  d9288f6... entry: allow disabling undo for GtkEntry
  454a7aa... gtk-demo: wrap text operations in irreversible actions
  a441e1c... gtk-demo: add an undo demo for GtkEntry
  ce0a9e2... gtk-demo: add a demo for TextView undo/redo
  9d35927... gtk-demo: set irreversable actions for textview demos
  afb23eb... migration: add GtkEntryBuffer::deleted-text to migration gu

Commits added to the branch:

  e3711a1... editable: add enable-undo property
  5bf0ad1... entrybuffer: remove text in ::deleted-text default handler
  d2eef7f... text: add undo support to GtkText
  c536a2b... gtk-demo: wrap text operations in irreversible actions
  7e082a7... gtk-demo: add an undo demo for GtkEntry
  df08ea9... gtk-demo: add a demo for TextView undo/redo
  af1463a... gtk-demo: set irreversable actions for textview demos
  2990c10... migration: add GtkEntryBuffer::deleted-text to migration gu