Andreas Schwab <schwab@linux-m68k.org> writes:

> On Apr 27 2019, Han Boetes <hboetes@gmail.com> wrote:
>
>> 6288  write(8, "\33[44d\33[K\33[2d\33[?25l[I\33[43;7H\33[30m"..., 80) = 80
>
> "\e[I" is the xterm focus-in event, so it looks like some race condition.

Indeed.  This behaviour is present in master, but not emacs-26.  Here's
the simplest repro for me under gnome-terminal on GNU/Linux:

0. emacs -Q --daemon=test
1. emacsclient -t -s test

Some environment variables follow my signature.  Although the above is
not reproducible 100% of the time, the following brings it down to 0% of
the time for me:

0. emacs -Q --daemon=test
1. TERM=xterm-direct emacsclient -t -s test

Another thing that brings the reproducibility down to 0% is the
following: