bug#14567: Scrolling of large images

[Eli Zaretskii]

> From: Thomas Wiecki <thomas.wiecki@gmail.com>
> Date: Sat, 8 Jun 2013 17:39:27 -0400
> Cc: 14567@debbugs.gnu.org
> 
> OK, it must have been something in my config file. If I launch emacs -Q I
> can't reproduce the behavior and scrolling seems to work just fine (any
> idea? Could be any package I suppose..).

Try bisecting your .emacs.

> I can't really reproduce the line-move error either in this mode. It
> does show up occasionally but I haven't figured out how to
> explicitly trigger it thus far.

I'll try reproducing it here.

> What I have figured out however, is that scrolling using page up/down still
> produces funky behavior. To reproduce set cursor at end of buffer, press
> page-up, buffer jumps to beginning rather than scrolling over image. Press
> page-down several times, cursor gets stuck after first page-down scroll.

I will look into cursor being stuck, but other than that, moving by
screen-fulls was not supposed to be affected by the change, because
it's not clear what exactly is a "page" in that case.  Only scrolling
with C-n/C-p or up/down arrow key was supposed to be affected.