GNU bug report logs - #8307
Scrolling problems in lexbind-new branch

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Juanma Barranquero <lekktu <at> gmail.com>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#8307: closed (Scrolling problems in lexbind-new branch)
Date: Mon, 21 Mar 2011 23:42:02 +0000

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Your message dated Tue, 22 Mar 2011 00:41:01 +0100
with message-id <AANLkTinAswiKWFBBhxGSn4WmxDAi5ZVJXOq_mdR96d_m <at> mail.gmail.com>
and subject line Re: bug#8307: Scrolling problems in lexbind-new branch
has caused the GNU bug report #8307,
regarding Scrolling problems in lexbind-new branch
to be marked as done.

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From: Juanma Barranquero <lekktu <at> gmail.com>
To: Bug-Gnu-Emacs <bug-gnu-emacs <at> gnu.org>
Subject: Scrolling problems in lexbind-new branch
Date: Mon, 21 Mar 2011 04:04:06 +0100

Version: 24.0.50
Package: emacs

I can reproduce this at will on lexbind-new, and not at all on trunk.

Assume you have a test file, test.txt, with many non-empty lines.
That's not really required (it could be any file long enough to cause
scrolling), but makes the bug easier to see.

In case it matters, I'm using DejaVu Sans Mono:

    uniscribe:-outline-DejaVu Sans
Mono-normal-normal-normal-mono-13-*-*-*-c-*-iso8859-1

Now do:

   emacs -Q --eval "(progn (setq scroll-conservatively 1)
(setq-default show-trailing-whitespace t))" test.txt
   <right>
   <down>  ;;; keep it pressed until it starts line-by-line scrolling

(The value of scroll-conservatively is irrelevant, as long as it is
greater than zero.)

What I see is that the cursor stops in the next-to-last line;
scrolling continues normally, but the cursor does not advance to the
last line. (In fact, if you keep it pressed down enough time, it
eventually moves to the last line, but in my setup that can take
several hundred lines.)

Now, with the cursor on the next-to-last line, move it to column 0, so

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
#xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx       ; # is the cursor position
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx       ; last line of the window,
line number N

Now <down> moves the cursor to the last line:

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
#xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx       ; last line of the window,
line number N

And then <right> moves to the right *and* scrolls the window:

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
x#xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx       ; line number N
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx       ; last line of the window


Another, likely related effect:

  emacs -Q --eval "(setq-default show-trailing-whitespace t)" test.txt

then keep <down> pressed.

Instead of scrolling to the last line of the window and then
recentering, it starts scrolling line-by-line once the cursor reaches
the middle point of the window height.

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From: Juanma Barranquero <lekktu <at> gmail.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 8307-done <at> debbugs.gnu.org
Subject: Re: bug#8307: Scrolling problems in lexbind-new branch
Date: Tue, 22 Mar 2011 00:41:01 +0100

On Mon, Mar 21, 2011 at 18:31, Stefan Monnier <monnier <at> iro.umontreal.ca> wrote:

> Maybe it's because I updated the lexbind
> branch to be in sync with the trunk.  Can you try it with the latest
> lexbind branch?

I cannot reproduce the bug with the latest lexbind-new, so I'm closing this bug.

    Juanma

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