Re: moving point and scroll-conservatively

[David De La Harpe Golden <david@harpegolden.net>]

On 26/06/10 12:34, Eli Zaretskii wrote:
> Did any of you who set scroll-conservatively to most-positive-fixnum
> notice that moving around an unmodified buffer became much slower,
> since revno 100620, when point moves far away?
>
> For example, with this recipe:
>
>    emacs -Q
>    M-: (setq scroll-conservatively most-positive-fixnum scroll-step 0) RET
>    C-x C-f xdisp.c
>    C-u 25000 M-g M-g
>
> it takes Emacs 17 seconds on my 3GHz machine to display xdisp.c around
> line 25000, whereas it's instantaneous in Emacs 23.2.
>

Yes, that does appear slow, though taking ~ 10 seconds on my machine.

> Btw, what do users of scroll-conservatively = most-positive-fixnum
> want from C-v and PageDown keys?  Is it okay to recenter in that case,
> or do you want to see the cursor on the last screen line in that case
> as well?  (Emacs does not currently distinguish between these two
> cases.  In fact, it does not care at all which command caused point to
> move.)
>

Well ... scroll-preserve-screen-position?  That seems to be working 
anyway on pgup/dn, the point stays on the same screen line and I don't 
see recentering.