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From: Chong Yidong <cyd@stupidchicken.com>
Newsgroups: gmane.emacs.devel
Subject: Re: static declaration inside `window_scroll_pixel_based' in
	window.c
Date: Wed, 08 Mar 2006 21:04:11 -0500
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Luc Teirlinck <teirllm@dms.auburn.edu> writes:

>>>From my earlier message:
>
>    Anyway, if the above quote from `(elisp)Writing Emacs Primitives' does
>    apply here, the problem would be easy to fix with the following patch,
>    which I can install if desired.
>
> No, I responded too quickly.  The patch is incorrect, since it always
> re-initializes preserve_y to -1 at the start of `window_scroll_pixel_based',
> defeating its static-ness. 

You can simply initialize it in syms_of_window.