From: martin rudalics <rudalics@gmx.at>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: Katsumi Yamaoka <yamaoka@jpl.org>, emacs-devel@gnu.org
Subject: Re: undo bug?
Date: Tue, 01 Apr 2008 22:53:27 +0200 [thread overview]
Message-ID: <47F2A0C7.7030402@gmx.at> (raw)
In-Reply-To: <jwvabkdfl78.fsf-monnier+emacs@gnu.org>
>>Couldn't we do away with undo-boundaries and always undo until the next
>>recorded position of `point'?
>
>
> In theory we could, but that may break various packages: of all the
> supported undo records, the "undo-boundary" is probably the only one
> that is used by external packages ;-(
What I had in mind was that `undo-boundary' would simply `record-point'
instead of inserting nil.
> Instead the current code tries to only insert a point-record when
> it's actually necessary.
Sometimes. For example I use the patch below to handle the (pretty
annoying) problem that when I redo an earlier insertion `point' ends up
_before_ the inserted text (my `undo' binds `undo-is-redo' to `equiv'
when calling `undo-more').
*** undo.c.~1.83.~ Sun Jan 20 10:33:56 2008
--- undo.c Fri Mar 7 19:38:40 2008
***************
*** 57,62 ****
--- 57,66 ----
int undo_inhibit_record_point;
+ /* Nonzero means undo is redo. */
+
+ int undo_is_redo;
+
/* Record point as it was at beginning of this command (if necessary)
and prepare the undo info for recording a change.
PT is the position of point that will naturally occur as a result of the
***************
*** 637,643 ****
so that undoing the marker adjustments
put the markers back in the right place. */
Finsert (1, &membuf);
! SET_PT (pos);
}
}
else if (MARKERP (car) && INTEGERP (cdr))
--- 641,648 ----
so that undoing the marker adjustments
put the markers back in the right place. */
Finsert (1, &membuf);
! if (! undo_is_redo)
! SET_PT (pos);
}
}
else if (MARKERP (car) && INTEGERP (cdr))
***************
*** 735,740 ****
--- 740,749 ----
DEFVAR_BOOL ("undo-inhibit-record-point", &undo_inhibit_record_point,
doc: /* Non-nil means do not record `point' in `buffer-undo-list'. */);
undo_inhibit_record_point = 0;
+
+ DEFVAR_BOOL ("undo-is-redo", &undo_is_redo,
+ doc: /* Non-nil means undo is redo. */);
+ undo_is_redo = 0;
}
/* arch-tag: d546ee01-4aed-4ffb-bb8b-eefaae50d38a
next prev parent reply other threads:[~2008-04-01 20:53 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-01 11:06 undo bug? Katsumi Yamaoka
2008-04-01 11:43 ` martin rudalics
2008-04-01 11:55 ` Katsumi Yamaoka
2008-04-01 15:07 ` Stefan Monnier
2008-04-01 18:52 ` martin rudalics
2008-04-01 19:25 ` Stefan Monnier
2008-04-01 20:53 ` martin rudalics [this message]
2008-04-02 13:59 ` Stefan Monnier
2008-04-02 17:01 ` martin rudalics
2008-04-03 13:55 ` Stefan Monnier
2008-04-03 14:43 ` martin rudalics
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