* allout.el (allout-post-undo-hook): New allout outline-change event hook
to signal undo activity. (allout-post-command-business): Run allout-post-undo-hook if an undo just occurred. (allout-after-copy-or-kill-hook), (allout-mode): Minor docstring changes. * allout-widgets.el (allout-widgets-after-undo-function): Ensure the integrity of the current item's decoration after it has been in the vicinity of an undo. (allout-widgets-mode): Include allout-widgets-after-undo-function on the new allout-post-undo-hook.
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