Re: Strange behaviour of the undo function

[Juri Linkov]

> The following seems to be a bug:
>
> Suppose the frame is splitted in say subwindow A and subwindow
> B. Select some text in A, yank it with mouse-2 somewhere in B, and
> then choose undo from the toolbar. The undo is done, but the point in
> B jumps to the position where the selection was made.
>
> Emacs-implementation used: Aquamacs Emacs for OSX, but with the "-Q"
> option so that all Aquamacs specific customizations don't apply.

While looking at this bug report, I found another bug.  The menu and
toolbar item "undo" doesn't become disabled when the pending undo
list is empty.  The following patch fixes this:

Index: lisp/menu-bar.el
===================================================================
RCS file: /cvsroot/emacs/emacs/lisp/menu-bar.el,v
retrieving revision 1.282
diff -c -r1.282 menu-bar.el
*** lisp/menu-bar.el    19 Nov 2005 11:23:04 -0000      1.282
--- lisp/menu-bar.el    6 Dec 2005 03:36:08 -0000
***************
*** 481,487 ****
              :enable (and (not buffer-read-only)
                           (not (eq t buffer-undo-list))
                           (if (eq last-command 'undo)
!                              pending-undo-list
                             (consp buffer-undo-list)))
              :help "Undo last operation"))
  
--- 481,487 ----
              :enable (and (not buffer-read-only)
                           (not (eq t buffer-undo-list))
                           (if (eq last-command 'undo)
!                              (listp pending-undo-list)
                             (consp buffer-undo-list)))
              :help "Undo last operation"))

-- 
Juri Linkov
http://www.jurta.org/emacs/