> From: Ship Mints <shipmints@gmail.com>
> Date: Mon, 23 Dec 2024 14:36:34 +0100
> Cc: jared@finder.org, rms@gnu.org, gerd.moellmann@gmail.com,
>       fgunbin@fastmail.fm, 74833@debbugs.gnu.org
>
> You should be able to paste using the (annoying, yes) CUA key Shift-Ins vs. right mouse button.

Yes, but that works also without xterm-mouse-mode.  My point is that I
lose the paste by mouse.

> I think the only way to know for sure you're under putty is to change your putty configuration to set/send a
> custom environment variable that you can test. I do not recall one that it sets/sends by default beyond TERM
> which is "xterm" and that's obviously insufficient.

You will have to tell more, as I didn't see anything like that.