* 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.

3 files changed, 36 insertions, 1 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 66215266bdb..20679038120 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,18 @@
+2011-07-05  Ken Manheimer  <ken.manheimer@gmail.com>
+
+        * 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.
+
+
 2011-07-05  Stefan Monnier  <monnier@iro.umontreal.ca>
 
         * emacs-lisp/lisp-mode.el (lisp-interaction-mode-abbrev-table):
diff --git a/lisp/allout-widgets.el b/lisp/allout-widgets.el
index 8dab7411750..ef75e7157e6 100644
--- a/lisp/allout-widgets.el
+++ b/lisp/allout-widgets.el
@@ -561,6 +561,8 @@ outline hot-spot navigation \(see `allout-mode')."
                   'allout-widgets-shifts-recorder nil 'local)
         (add-hook 'allout-after-copy-or-kill-hook
                   'allout-widgets-after-copy-or-kill-function nil 'local)
+        (add-hook 'allout-post-undo-hook
+                  'allout-widgets-after-undo-function nil 'local)
 
         (add-hook 'before-change-functions 'allout-widgets-before-change-handler
                   nil 'local)
@@ -1130,6 +1132,14 @@ Dispatched by `allout-widgets-post-command-business' in response to
 Intended for use on allout-after-copy-or-kill-hook."
   (if (car kill-ring)
       (setcar kill-ring (allout-widgets-undecorate-text (car kill-ring)))))
+;;;_   > allout-widgets-after-undo-function ()
+(defun allout-widgets-after-undo-function ()
+  "Do allout-widgets processing of text after an undo.
+
+Intended for use on allout-post-undo-hook."
+  (save-excursion
+    (if (allout-goto-prefix)
+        (allout-redecorate-item (allout-get-or-create-item-widget)))))
 
 ;;;_   > allout-widgets-exposure-undo-recorder (widget from-state)
 (defun allout-widgets-exposure-undo-recorder (widget)
diff --git a/lisp/allout.el b/lisp/allout.el
index 5b8a7a7de1a..592a64c647a 100644
--- a/lisp/allout.el
+++ b/lisp/allout.el
@@ -1461,7 +1461,15 @@ This hook might be invoked multiple times by a single command.")
 (defvar allout-after-copy-or-kill-hook nil
   "*Hook that's run after copying outline text.
 
-Functions on the hook should not take any arguments.")
+Functions on the hook should not require any arguments.")
+;;;_   = allout-post-undo-hook
+(defvar allout-post-undo-hook nil
+  "*Hook that's run after undo activity.
+
+The item that's current when the hook is run *may* be the one
+that was affected by the undo.
+
+Functions on the hook should not require any arguments.")
 ;;;_   = allout-outside-normal-auto-fill-function
 (defvar allout-outside-normal-auto-fill-function nil
   "Value of normal-auto-fill-function outside of allout mode.
@@ -1874,6 +1882,7 @@ without changes to the allout core.  Here are key ones:
 `allout-structure-deleted-hook'
 `allout-structure-shifted-hook'
 `allout-after-copy-or-kill-hook'
+`allout-post-undo-hook'
 
                             Terminology
 
@@ -3313,6 +3322,7 @@ coordinating with allout activity.")
 
     (when allout-just-did-undo
       (setq allout-just-did-undo nil)
+      (run-hooks 'allout-post-undo-hook)
       (cond ((and (= buffer-saved-size -1)
                   allout-auto-save-temporarily-disabled)
              ;; user possibly undid a decryption, deinhibit auto-save: