force-mode-line-update in post-command-hook renders scroll-conservatively worthless

force-mode-line-update in post-command-hook renders scroll-conservatively worthless

[Juanma Barranquero]

emacs -q --no-site-file
M-x set-variable scroll-conservatively 1000000
C-x C-n
<down>...                ; Scrolls one line at a time
M-x ruler-mode
<down>...                ; Cursor jumps to the middle of screen
                         ; while scrolling the window

The reason is not ruler-mode, but the fact that it does:

(add-hook 'post-command-hook #'force-mode-line-update nil t)

AFAICS, adding `force-mode-line-update' (or in fact any function that
calls `set-buffer-modified-p') to post-command-hook makes
`scroll-conservatively' useless in all 21.X releases. It worked fine in
20.7.


                                                           /L/e/k/t/u

Re: force-mode-line-update in post-command-hook renders scroll-conservatively worthless

[Richard Stallman]

I fixed that.

Re: force-mode-line-update in post-command-hook renders scroll-conservatively worthless

[Juanma Barranquero]

On Tue, 16 Jul 2002 07:29:02 -0600 (MDT), Richard Stallman <rms@gnu.org> wrote:

> I fixed that.

Thanks.

Curiously, activating the ruler-mode still "activates" too the recently
reported redisplay bug. An easy way to see it:

emacs -q --no-site-file
C-h C-n
M-x set-variable scroll-conservatively 1000000
M-x ruler-mode
<down>....


                                                           /L/e/k/t/u

Re: force-mode-line-update in post-command-hook renders scroll-conservatively worthless

[Richard Stallman]

    Curiously, activating the ruler-mode still "activates" too the recently
    reported redisplay bug. An easy way to see it:

    emacs -q --no-site-file
    C-h C-n
    M-x set-variable scroll-conservatively 1000000
    M-x ruler-mode
    <down>....

It worked for me with the changes I made.  The changes
were installed this morning.  Perhaps that was after you tried it.

Re: force-mode-line-update in post-command-hook renders scroll-conservatively worthless

[Juanma Barranquero]

On Tue, 16 Jul 2002 21:03:39 -0600 (MDT), Richard Stallman <rms@gnu.org> wrote:

> It worked for me with the changes I made.  The changes
> were installed this morning.  Perhaps that was after you tried it.

I think I wasn't clear enough. The scrolling bug is now fixed (thanks).

What's still there is the redisplay bug reported by David Ponce and Kim
F. Storm. I mentioned it because the only way I know of triggering it is
activating ruler-mode.

                                                           /L/e/k/t/u