Re: show-paren-mode prevents page-down from displaying next 1/2 page.

[Chong Yidong]

"Maguire, Andrew (GE Infra, Energy)" <address@hidden> writes:

> Here goes: 
>
> (require 'cl-macs)
> (defun test:scroll-up:show-paren-mode ()
> ...

This glitch occurs because show-paren-mode tries to highlight before
window-start, which forces the redisplay engine to recenter.  It's no
big deal, but I believe this patch fixes it.  Could someone help me
double-check?

*** emacs/lisp/paren.el.~1.71.~ 2007-01-21 13:34:19.000000000 -0500
--- emacs/lisp/paren.el 2007-04-18 18:25:16.000000000 -0400
***************
*** 146,152 ****
            pos mismatch face)
        ;;
        ;; Find the other end of the sexp.
!       (when dir
          (save-excursion
            (save-restriction
              ;; Determine the range within which to look for a match.
--- 146,154 ----
            pos mismatch face)
        ;;
        ;; Find the other end of the sexp.
!       (when (or (= dir 1)
!                 (and (= dir -1)
!                      (>= (1- (point)) (window-start))))
          (save-excursion
            (save-restriction
              ;; Determine the range within which to look for a match.