Re: scroll-preserve-screen-position not working

[martin rudalics]

> the scroll-preserve-screen-position variable had been
> introduced some time ago in emacs 20. It allows to
> keep the cursor in its position in a buffer when scrolling.
> When it is not set, the cursor position is moved when
> scrolling so as to make it always visible.
> In emacs 21 (and alas in 22) this variable has no effect,
> at least when emacs in running in Windows XP and also in
> Vista.

Thank you for your report.

Customization for this variable was broken.  Could you please apply the
attached patch and tell me whether it gives good results.

*** cus-start.el        Tue Jan 23 06:40:00 2007
--- cus-start.el        Sat Apr  7 13:41:38 2007
***************
*** 338,344 ****
             (split-height-threshold windows integer)
             (window-min-height windows integer)
             (window-min-width windows integer)
!            (scroll-preserve-screen-position windows boolean)
             (display-buffer-reuse-frames windows boolean "21.1")
             ;; xdisp.c
             (scroll-step windows integer)
--- 338,348 ----
             (split-height-threshold windows integer)
             (window-min-height windows integer)
             (window-min-width windows integer)
!            (scroll-preserve-screen-position
!             windows (choice
!                      (const :tag "Off (nil)" :value nil)
!                      (const :tag "Full screen (t)" :value t)
!                      (other :tag "Always")))
             (display-buffer-reuse-frames windows boolean "21.1")
             ;; xdisp.c
             (scroll-step windows integer)