Subject: bug#20404: 25.0.50; Sometimes no fontification with jit-lock-defer-time

From: Eli Zaretskii <[email-masked]>
Date: Thu, 23 Apr 2015 00:39:23 +0300

> From: Tassilo Horn <[email-masked]>
> Cc: [email-masked]
> Date: Wed, 22 Apr 2015 22:32:14 +0200
> 
> > Sounds like the idle timer that is started by jit-lock-defer-time
> > never runs after the buffer is displayed.
> 
> Indeed, that's the case.  Or wait, it eventually runs but much later
> than `jit-lock-defer-time' defines.
> 
> > Could it be that it already ran before the display?
> 
> No.  The bug report buffer is displayed first, and then it takes two or
> three seconds until the first jit-lock kicks in.  And then the buffer
> will be redisplayed and appears fontified.

So you are saying that something prevents the timer to run at the
prescribed time?  I suggest to add trace printf's in the code that
traverses the idle-timers' list, and see why this timer doesn't run on
time.