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address@hidden: mouse-drag.el and automatic-hscrolling interact poorl


From: Richard Stallman
Subject: address@hidden: mouse-drag.el and automatic-hscrolling interact poorly]
Date: Sat, 26 Oct 2002 16:15:29 -0400

[I sent this message a few weeks ago but did not get a response.]

Could you please take a look at this problem?

------- Start of forwarded message -------
Envelope-to: address@hidden
Delivery-date: Wed, 09 Oct 2002 19:55:27 -0400
From: Paul Du Bois <address@hidden>
To: address@hidden
Subject: mouse-drag.el and automatic-hscrolling interact poorly
X-OriginalArrivalTime: 09 Oct 2002 23:57:04.0956 (UTC) 
FILETIME=[918C67C0:01C26FEF]
Sender: address@hidden
Date: 9 Oct 2002 16:57:04 -0700

This bug report will be sent to the Free Software Foundation,
not to your local site managers!
Please write in English, because the Emacs maintainers do not have
translators to read other languages for them.

Your bug report will be posted to the address@hidden mailing list,
and to the gnu.emacs.bug news group.

In GNU Emacs 21.2.1 (i386-msvc-nt5.1.2600)
 of 2002-03-19 on buffy
configured using `configure --with-msvc (12.00)'
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: ENU
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: nil

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

;; eg

(require 'mouse-drag)
(define-key global-map [M-down-mouse-1] 'mouse-drag-drag)
(setq automatic-hscrolling t)
;; switch to an interesting buffer
(setq truncate-lines t)

;; 1. put point in the middle of a line
;; 2. do a leftward M-drag
;; 3. Notice that as the cursor approaches the left edge of the
;; screen, the hscroll resets to 0

A quick fix is to modify the (let (...) ) in mouse-drag-safe-scroll to
temporarily unset automatic-hscrolling.  I don't know whether that's a real
fix or just a workaround -- I don't understand this comment in scroll-right:

   If `automatic-hscrolling' is non-nil, the argument ARG modifies
   a lower bound for automatic scrolling, i.e. automatic scrolling
   will not scroll a window to a column less than the value returned
   by this function.

p



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