GNU bug report logs - #26347
patch for mwheel.el

Previous Next

Full log

View this message in rfc822 format

From: Eli Zaretskii <eliz <at> gnu.org>
To: Tak Kunihiro <tkk <at> misasa.okayama-u.ac.jp>
Cc: rudalics <at> gmx.at, 26347 <at> debbugs.gnu.org
Subject: bug#26347: patch for mwheel.el
Date: Wed, 05 Apr 2017 05:36:39 +0300

> From: Tak Kunihiro <tkk <at> misasa.okayama-u.ac.jp>
> Date: Wed, 5 Apr 2017 08:18:42 +0900
> Cc: Kunihiro Tak <tkk <at> misasa.okayama-u.ac.jp>,
>  rudalics <at> gmx.at,
>  26347 <at> debbugs.gnu.org
> 
> Now I leaned auto-hscroll-mode is irrelevant to horizontal scroll.
> However, I still insist that it should be off on horizontal and
> vertical scrolling.
> 
> (A) It should be off during vertical scroll.  Let’s consider a buffer
>    is with short and long alternative lines and when point is at the
>    end of long line, at the top of current window.  After `scroll-up
>    1', point jumps to the end of the next short line and you see scope
>    shifts suddenly leftward. This behavior is sometimes unexpected
>    one.
> 
> (B) It should be off during horizontal scroll.  During horizontal
>    scroll, you may scroll a little in vertical direction without
>    intention.  The horizontal scroll should be tolerance against such
>    perturbation.  The source of concern is same as (A).
> 
> The concern (A) is shared with vertical scroll-bar.  With this
> respect, the concern should be solved by `scroll-up' not by
> `mwheel-scroll'.
> 
> I think when point moves off the left edge of the window with cursor
> frozen at the left edge of the window, `scroll-up' should scroll up
> without horizontal shift.
> 
> Conclusion: Yes.

The considerations you present are not special to the proposed
horizontal scrolling using a mouse wheel, they are valid for any
scrolling.  IOW, this is how scrolling behaved in Emacs since about
forever.  And I think it's not a good idea to have some methods of
scrolling behave differently from others.  So I could agree to having
a user option to temporarily disable auto-hscroll-mode during
scrolling, but the default behavior should be what we have now, and
the option should affect all methods of scrolling alike.

Thanks.

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.