Re: Redisplay bug

[storm@cua.dk (Kim F. Storm)]

Andreas Schwab <schwab@suse.de> writes:

> Luc Teirlinck <teirllm@dms.auburn.edu> writes:
> 
> |> Andreas Schwab wrote:
> |> 
> |>    Does anyone else see this redisplay bug?  I do M-x info, visit the Emacs
> |>    manual, scroll down 2 pages.  When I now scroll back 2 pages the display
> |>    is completely messed up.
> |> 
> |> This seems related to the header line.
> 
> I don't think so.  Another way to trigger the bug: enable
> global-font-lock-mode, load some C file, resize Emacs so that the last
> line is only partially visible, ie. the frame size is not a multiple of
> the font size.  Now type M-> to go to point-max and scroll up one line at
> a time (M-1 M-v).  As soon as the cursor hits the last frame line the
> display is garbled.  This happens only when point is at point-max.
> 

This has been reported several times now.

It is related to changes Richard made to xdisp.c some time ago.

The change was intended to fix a problem with scrolling leaving a
partially visible line at the bottom (or top) of the window -- but the
change doesn't work correctly when that line is the last (first) line
of the buffer.

Is someone working on fixing this, or should I give it a try?


-- 
Kim F. Storm <storm@cua.dk> http://www.cua.dk