`set-window-hscroll' doesn't scroll

`set-window-hscroll' doesn't scroll

[Bertil Askelid]

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In GNU Emacs 21.2.1 (i386-redhat-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2002-04-08 on porky.devel.redhat.com
configured using `configure  i386-redhat-linux --prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib --libexecdir=/usr/libexec --localstatedir=/var --sharedstatedir=/usr/com --mandir=/usr/share/man --infodir=/usr/share/info --with-gcc --with-pop --with-sound'
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: en_US.iso885915
  locale-coding-system: iso-latin-9
  default-enable-multibyte-characters: nil

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

   (set-window-hscroll (selected-window) 40)

   doesn't cause any horizontal scrolling at all

Recent input:
<mouse-movement> <mouse-movement> <mouse-movement>
<mouse-movement> <mouse-movement> <mouse-movement>
<drag-mouse-1> <switch-frame> <down-mouse-2> <mouse-2>
C-z C-k y <switch-frame> <down-mouse-1> <mouse-1> <double-down-mouse-1>
<mouse-movement> <double-mouse-1> M-x <S-f8> <retu
rn>

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Re: `set-window-hscroll' doesn't scroll

[Eli Zaretskii]

> From: Bertil Askelid <Bertil@Askelid.com>
> Date: Tue, 4 Jun 2002 13:24:55 -0700
> 
>    (set-window-hscroll (selected-window) 40)
> 
>    doesn't cause any horizontal scrolling at all

Probably because your cursor would become invisible if the window is
scrolled 40 columns to the right.  Emacs doesn't let you scroll the
window so that the location of the cursor becomes invisible.

Try "C-x 3", then "C-u 50 C-f", and _then_ evaluate the above
expression.  I think you'll see then that it works.

Re: `set-window-hscroll' doesn't scroll

[Eli Zaretskii]

> From: Bertil Askelid <Bertil@Askelid.com>
> Date: Tue, 4 Jun 2002 13:24:55 -0700
> 
>    (set-window-hscroll (selected-window) 40)
> 
>    doesn't cause any horizontal scrolling at all

As an alternative to what I wrote in my other message, set the
variable automatic-hscrolling to nil, and then the call to
set-window-hscroll will work unconditionally.  (Automatic horizontal
scrolling makes sure the cursor is always visible, and it's by default
on.)