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From: "Eli Zaretskii" <eliz@is.elta.co.il>
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Subject: Re: signal handling bogosities
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> From: Richard Stallman <rms@gnu.org>
> Date: Fri, 20 Dec 2002 12:12:24 -0500
> 
> If we handle mouse highlighting by generating input events to do the
> work at main program level, then the highlighting won't change when
> you move the mouse while Emacs is running a Lisp program.  Is that
> acceptable?

I think it might be acceptable if Emacs displays the busy cursor (as
it does by default, IIRC).  The cursor chape tells the user that
Emacs is busy.