Emacs freezes and takes 100% CPU

[Markus Gritsch]

Hi,

I think I have found a serious bug.  The minimum .emacs file to 
reproduce the bug looks like:

--- 8< ---

(setq-default truncate-lines t)
(custom-set-variables
  '(hscroll-margin 20)
  '(hscroll-step 1)
)

--- 8< ---

Setting all three variables is necessary.  After starting Emacs, I
change the horizontal width of the Emacs frame to something quite
narrow, and then I try to move the cursor in the first line to the right
-> Emacs freezes.

I am using the prebuilt CVS Emacs for Windows from 
http://www.crasseux.com/emacs/.  Can someone on another platform please 
try to reproduce the bug, to see if it is specific to the Win32 version 
or a general problem?

Thanks in advance,
Markus