tmux: mouse works in st but not in xterm

Dear list,


when I run tmux in xterm, the mouse support does not work.
When I run tmux in the st terminal, mouse support is
functional (e.g., I can resize the panes). Can somebody
perhaps have a clue, what can be going on? On linux, there
is no problem in xterm. I also renamed ~/.Xdefaults to get
any settings there out of the game, tried to set TERM to the
same value as st uses, but all to no avail. I do not know
what to try next.

Thanks!


Ruda



PS.: I do have

set -g mouse on

in ~/.tmux.conf; that's why mouse works in st.