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From: "Richard M. Stallman" <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: allocate_string_data memory corruption
Date: Thu, 19 Jan 2006 20:14:33 -0500
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Xref: news.gmane.org gmane.emacs.devel:49286
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    BTW, it's possible that -DSYNC_INPUT fixes the bug.

The reason why -DSYNC_INPUT isn't the default
is that redraw events don't get handled until Emacs reads input.

Can you figure out some other way to cause redraws to be handled
reasonably soon?