Mouse reporting incompatible with tmux feature

[Alexander Huemer]

Hi,

I recently learned about a new feature in tmux that I like quite a bit.
It's in git master, but not released yet.
What it does is that it detects where the mouse pointer is if you have 
multiple panes and focuses that pane automatically without you having to 
click anywhere or hit the keyboard. Similar to what certain window 
managers do for X11 windows.

I tried this, it works as expected in xterm, alacritty and st, but does 
not in urxvt, which is my main terminal emulator. There is a github 
issue open for tmux[2].

Somebody on IRC advised that mouse reporting in urxvt works 
'differently' than in other terminal emulators, I don't understand the 
specifics though.

Can anything be done to make this work with urxvt?

Thanks,
-Alex

[1] https://github.com/tmux/tmux/commit/f72832cc085be4fdc0220be340087b2110feb4cf
[2] https://github.com/tmux/tmux/issues/4971