bug#28591: 27.0.50; xterm-set-window-title

[Eli Zaretskii]

> Date: Fri, 29 Sep 2017 09:05:42 -0400
> From: Mark Oteiza <mvoteiza@udel.edu>
> Cc: yamaoka@jpl.org, 28591@debbugs.gnu.org
> 
> Correction: deleting a frame does not restore the window title as
> Katsumi pointed out.

So you are saying the title is only restored when Emacs exits?
Otherwise, I think I'm missing something: in what case(s) your
restoration code does work?