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Re: scroll-up makes no progress on overtall lines

From: David Kastrup
Subject: Re: scroll-up makes no progress on overtall lines
Date: Wed, 20 Jul 2005 13:11:30 +0200
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux)

address@hidden (Kim F. Storm) writes:

> David Kastrup <address@hidden> writes:
>> This bug report will be sent to the Free Software Foundation,
>> not to your local site managers!
>> Please write in English if possible, because the Emacs maintainers
>> usually do not have translators to read other languages for them.
>> Your bug report will be posted to the address@hidden mailing list.
>> Please describe exactly what actions triggered the bug
>> and the precise symptoms of the bug:
>> Hi Kim, when I use preview-latex to generate a line that is taller
>> than the buffer and then repeatedly press <next>, the screen position
>> goes through a somewhat strange circular pattern, but never manages to
>> scroll through it.  scroll-down, previous-line and next-line all
>> manage to make it through the image, in contrast.
> I suppose that line contains an image as the last thing.

Excepting the newline character.

> If that line is the _last_ visible line in the buffer,

Not at all.

> you see some jumpy effects in next when it reaches the last part of
> that line.
> I looked at it before, and found that it is a bad interaction between
> placing the image text property on the last NL in the buffer and the
> way eolp and eobp works.
> If it happens in the middle of a buffer, I would like to know more
> about how to reproduce it.

Load circ.tex from preview-latex, do C-c C-p C-d wait until it
finishes, then do C-x 2 and drag the modeline up until the top window
has maybe 1/4 of the screen estate (10 lines or so).  Go to the top of
the file, press <next> (Page-Down) and let auto-repeat cater for the
rest.  You will get stuck at a larger image in the middle of the

David Kastrup, Kriemhildstr. 15, 44793 Bochum

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