scrolling very buggy (slider, arrows) under OS X

[David Reitter]

Under OS X, Emacs behaves very strangely with regard to the scrollbars 
and sliders. When you just click on a slider without moving it (after 
you've scrolled to the middle of the document), you will see that the 
text scrolls right away, often far beyond the document. Intended 
behavior would be not to do anything.

When the slider is moved, scrolling looks fine at first. However, I can 
then move beyond the document. Good behavior under OS X would be to 
stop scrolling just when one line after the document is located at the 
bottom end of the screen (i.e. frame).

Also, during scrolling, the size of the slider changes. That should 
never be, as the size indicates the length of the document in relation 
to the size of the whole scrollbar. That's an old paradigm! 
Consequently, the size of the slider only changes if the document size 
changes.

Furthermore, clicking on one of the little arrows doesn't result in an 
immediate scroll action (one line). It only scrolls when the mouse 
button is released. Good behavior would be to scroll as soon as the 
button is down, and then scroll again (line by line, but continuously), 
after a short delay -- just like pressing a key will repeat that letter 
on and on after a delay.

Several bugs at once, I hope something can be done about it!

By the way, my version is a current checkout from CVS with Yamamoto 
Mitsuharu's macterm.c patch (from March 7) applied.

Best
Dave



In GNU Emacs 21.3.50.1 (powerpc-apple-darwin7.2.0)
 of 2004-03-08 on catherine
configured using `configure '--enable-carbon-app' '--without-x''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: nil
  locale-coding-system: nil
  default-enable-multibyte-characters: t

Major mode: Prolog[SWI]

Minor modes in effect:
  cua-mode: t
  show-paren-mode: t
  recentf-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  unify-8859-on-encoding-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<mouse-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<scroll-bar-movement> <scroll-bar-movement> <scroll-bar-movement>
<drag-mouse-1> <menu-bar> <help-menu> <report-emac
s-bug>

Recent messages:
Scanning buffer for index ( 95%)
Scanning buffer for index (100%)
Error during redisplay: (invalid-regexp Regular expression too big) [2 
times]
Scanning buffer for index (  0%)
Scanning buffer for index ( 84%)
Scanning buffer for index ( 91%)
Scanning buffer for index ( 97%)
Scanning buffer for index (100%)
Error during redisplay: (invalid-regexp Regular expression too big) [45 
times]
Loading emacsbug...done