bug#28850: 26.0.90; Error running timer 'jit-lock-stealth-fontify': (error "Invalid search bound (wrong side of point)")

[Eli Zaretskii]

> Date: Wed, 25 Oct 2017 19:11:37 +0000
> Cc: 28850@debbugs.gnu.org
> From: Alan Mackenzie <acm@muc.de>
> 
> Actually, it wasn't that difficult to amend that form generator.  Would
> you please try out the patch below, which should apply cleanly to
> master.

I think you've solved the problem, because I let Emacs run idle for 10
hours, and it didn't hit this error even once.

Thanks.  Please push to the release branch.