Re: The unwarranted scrolling assumption

[Eli Zaretskii]

> From: Lennart Borgman <address@hidden>
> Date: Fri, 18 Jun 2010 17:08:18 +0200
> Cc: address@hidden
> 
> You are looking for the reason why reconsider_clip_changes does not do
> its job. I have said (though maybe not explicitly enough, I don't
> know) that it can't because it does not have the information it needs.
> 
> It does not have that information because narrow_to_region has erased
> it by setting clip_changed to 1.

The information is not erased, it is still present in
w->current_matrix->zv and w->current_matrix->begv.  You will see that
reconsider_clip_changes uses those to decide whether to reset the
clip_changed flag.