Salut Jean-Michel,

BESSOT Jean-Michel wrote on Sat, Mar 08, 2025 at 04:45:03PM +0100:

> Thank you for the answer. I made sperctwm run xterm without tmux
> automatically and I have the accented character. When I run tmux on the
> launched xterm after I have also the accented characters. Seems like
> something with xterm -e tmux.

It feels like you have been doing some serious diagnostic work here,
so it looks like we have come a bit closer to understanding the problem,
but we are not quite there yet.

Right now, four (!!) programs are involved in the way you are
reproducing the problem on your machine:

 1. spectrwm (from ports)
 2. xterm(1)
 3. ksh(1)
 4. tmux(1)

To isolate the problem, it would be good to find a way to reproduce
the problem with fewer programs involved.  Ideally, we should try to
get spectrwm out of the picture - when only base system software is
involved and there is still a bug, it becomes much easier to find
interested developers.

You say it "seems like something with xterm -e tmux".
Unfortunately, that does not seem to be the whole story
because when i run "xterm -e tmux" with default settings
under the default window manager fvwm(1), typing accent aigu,
accent grave, cedille and the like works for me in the resulting
xterm-tmux-ksh window.

Are you able to find out which command *exactly* spectrwm is running
on your machine when the problem occurs?  Is it really
exactly "xterm -e tmux" with no additional arguments?

When you run the exact same command that sperctwm runs,
but manually from an interactive shell rather than from spectrwm,
what happens then?

Yours,
  Ingo

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