Re: Crash when having malformed PBM image on screen and viewing *Messages* buffer (on Windows)

[Jason Rumney]

>> (progn
>>   (put-image '(image :type xpm :data "") 0)
>>   (pop-to-buffer "*Messages*")
>>   (goto-char (point-max)))
>>
>> Now press <down> <right> <down> <right>.
>>     

This crashes X as well. I think the bug is caused by moving point in
*Messages* as it reaches messages-buffer-max-lines. The crash is caused
by point being greater than point-max.

There doesn't seem to be a problem with the handling of malformed PBMs
and XBMs, this is just a catalyst to cause error messages to be appended
to the *Messages* buffer.