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Re: Image scroll issue

From: Chris Moore
Subject: Re: Image scroll issue
Date: Tue, 02 Jan 2007 23:55:50 +0100
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.0.92 (gnu/linux)

address@hidden (Kim F. Storm) writes:

> Ok, so what about C-n / C-p ?

If I have already used 2 C-v's to get 'into' the image, then C-n does
much the same as C-v, and scrolls down to 14% for half a second before
it jumps back to 9% again.  Each following C-n does the same, never
reaching the bottom of the image.  That is, unless I type 2 C-n's
quickly, in which case it starts behaving much better, and lets me
step through the image one line at a time.

> What is the value of the variables timer-list and timer-idle-list ?

timer-list is a variable defined in `C source code'.
Its value is nil

timer-idle-list is a variable defined in `C source code'.
Its value is 
([t 0 0 125000 t show-paren-function nil t]
 [nil 0 0 500000 0.5 blink-cursor-start nil t]
 [nil 0 0 500000 t jit-lock-context-fontify nil t]
 [nil 0 16 0 t jit-lock-stealth-fontify nil t])

ie. nothing much!

> A lot of efforts have gone into making Emacs 22 scroll images in a
> _reasonable_ way (not perfect, but much much better than Emacs 21).

I have noticed that it has got a lot better recently, but as you say
it's still not perfect:

If I visit a .jpg file and hit C-v a few times, I scroll down the
image, but when I get to the bottom, it wraps back to the top again.
M-< and M-> don't do anything.  The scrollbar doesn't update to show
my position through the image.  Dragging the scrollbar's handle down
doesn't scroll the image, but clicking below the handle does scroll
the image one page at a time.  Etc, etc.  I'm assuming these bugs are
all known because they're so apparent, but maybe that's not the case.

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