Richard Stallman <rms@gnu.org> writes:

>     In the *newsticker* buffer that is now current, movement commands such as
>     n or <down> appear to have no effect, but the effect becomes apparent
>     following a C-l.  Alos, the scroll bar is not rendered properly.
>
> I suspect that this is all caused by a single display bug.
> Can you help determine which change caused the bug to appear?
>
> This is the sort of thing on which various people can work in parallel.
>
> A binary search thru the versions since the last one known not
> to have this bug would do the job.

I have narrowed down the responsible change to between 2007-08-31 and
2007-09-01.

From src/ChangeLog:

--8<---------------cut here---------------start------------->8---
2007-08-31  Jan Djärv  <jan.h.d@swipnet.se>

        * gtkutil.c (update_frame_tool_bar): Initialize wbutton to NULL.

2007-08-31  Stefan Monnier  <monnier@iro.umontreal.ca>

        * frame.h:
        * frame.c (Qterm_environment_variable): Remove.
        (syms_of_frame): Don't init and staticpro it.


        * callproc.c (getenv_internal): Remove special case for $TERM.

        * callproc.c (Vinitial_environment): New variable.
        (set_initial_environment): Initialize it.
        (syms_of_callproc): Declare it.
        (child_setup): Don't mess with TERM via Qterm_environment_variable; the
        TERM under which a process runs is never related to the TERM in which
        Emacs is running.
--8<---------------cut here---------------end--------------->8---

I compiled a failing version using --with-x-toolkit=no and this resolved
the problem, so I suspect the gtkutil.c change.

I have attached the output of cvs diff -D 2007-08-31 -D 2007-09-01.

Hopefully this will help to identify what the problem is.

Oh, I should mention that I also tried HEAD again and the problem still
exists.

Regards,
Toby.