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From: Richard Stallman <rms@gnu.org>
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Subject: Re: latest cvs segfault
Date: Tue, 17 Dec 2002 13:44:33 -0500
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    > The change below may fix the problem, but I am not certain it is
    > correct.  Anyway, can you please run under GDB all the time, with a
    > breakpoint set in set_cursor_from_row like this?

    This appears to have fixed the problem.  I haven't had a segfault
    since installing this.

It certainly avoids the seg fault.  We don't know if it is correct.