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delete-overlay causes recentering (was: address@hidden: a bug in global-
From: |
Johan Bockgård |
Subject: |
delete-overlay causes recentering (was: address@hidden: a bug in global-hl-line-mode]) |
Date: |
Fri, 13 Apr 2007 15:22:01 +0200 |
User-agent: |
Gnus/5.110006 (No Gnus v0.6) Emacs/22.0.93 (gnu/linux) |
Thread started at
http://lists.gnu.org/archive/html/emacs-devel/2007-03/msg00360.html
address@hidden (Kim F. Storm) writes:
> The cursor may seems to end up on the wrong line, but it should be
> placed on the BUFFER POSITION where you clicked with the mouse.
>
> This is because the screen may scroll a few lines as a result of the
> click in such a line, so it just looks wrong.
>
> Please double check!
>
>
> That scrolling is very hard to get rid of -- so that's for after the
> release.
It seems that in the situation above the scrolling is caused by
delete-overlay, not by the click.
Here's another example:
$ emacs -Q
Evaluate the code below. Then press f8, f9, f8, f9, ...
;;;;;;;;;;;;;;;;
(defvar ov nil)
(defun foo ()
(interactive)
(set-window-start (selected-window) 834)
(goto-char 1237)
(setq ov (make-overlay 1237 1242))
(overlay-put ov 'face 'highlight))
(defun bar ()
(interactive)
(delete-overlay ov))
(global-set-key [f8] 'foo)
(global-set-key [f9] 'bar)
(progn
(switch-to-buffer "*foo*")
(dotimes (n 30)
(insert "Emacs is the extensible, customizable, "
"self-documenting real-time display editor. "))
(goto-char (point-min))
(insert " "))
;;;;;;;;;;;;;;;;
delete-overlay causes a recentering. (Actually, so do mouse clicks in
this case.)
There is no scrolling if the last edit was after the window start,
however (remove `(goto-char (point-min))' or make a change at the end
of the buffer)!
I can also see the "spurious scrolling bug" mentioned in FOR-RELEASE
in the *foo* buffer. Occasionally the text jumps while just looking at
it.
--
Johan Bockgård
- delete-overlay causes recentering (was: address@hidden: a bug in global-hl-line-mode]),
Johan Bockgård <=
- Re: delete-overlay causes recentering, martin rudalics, 2007/04/14
- Re: delete-overlay causes recentering, Chong Yidong, 2007/04/14
- Re: delete-overlay causes recentering, Chong Yidong, 2007/04/14
- Re: delete-overlay causes recentering, Chong Yidong, 2007/04/15
- Re: delete-overlay causes recentering, Kim F. Storm, 2007/04/15
- Re: delete-overlay causes recentering, Johan Bockgård, 2007/04/23
- Re: delete-overlay causes recentering, Chong Yidong, 2007/04/23
- Re: delete-overlay causes recentering, Chong Yidong, 2007/04/23
- Re: delete-overlay causes recentering, Stefan Monnier, 2007/04/23