Subject: bug#15045: Point jumps inappropriately around time of Semantic lexing

From: Eli Zaretskii <[email-masked]>
Date: Fri, 09 Aug 2013 00:47:47 +0300

> Date: Thu, 8 Aug 2013 16:03:30 -0400
> From: Barry OReilly <[email-masked]>
> Cc: Stefan Monnier <[email-masked]>, [email-masked], 
> 	"Eric M. Ludlam" <[email-masked]>, Eli Zaretskii <[email-masked]>
> 
> If arbitrary timers can execute during the lexer's call to
> accept-process-output or input-pending-p, then doesn't that mean
> jit-lock-deferred-fontify can run too?

Not normally, because jit-lock-deferred-fontify runs off an idle
timer, and Emacs is not idle in the situation you describe.