bug#34260: 27.0.50; Emacs randomly hangs during redisplay

[Eli Zaretskii]

> From: Michael Heerdegen <michael_heerdegen@web.de>
> Date: Wed, 30 Jan 2019 22:46:26 +0100
> Cc: 34260@debbugs.gnu.org
> 
> John Shahid <jvshahid@gmail.com> writes:
> 
> > Let me know how I can debug this issue further.  Would the display
> > engine trace help in this case ?  Emacs doesn't enter an infinite
> > recursion but from the CPU usage it is entering some sort of infinite
> > loop, but I can't figure out why.
> 
> What you write reminds me of the bug I (a user) had reported: Bug
> #34179.

Certainly sounds like the same bug.