Issue with tmux update

Issue with tmux update

[Ergus]

Hi,

After my system updated tmux to version 3.5 on October 1st, I noticed
that the keybinding combination "C-M-/" (which I use for undo-redo) has
stopped working in certain setups.

Here’s what I’ve observed:

When I try `emacs -nw` followed by `C-h k C-M-/`:

xterm: Works fine
xterm + tmux: Works fine

foot: Works fine
foot + tmux: Outputs M-[ 2 7 ; 7 ; 9 5 is undefined

alacritty: Works fine
alacritty + tmux: Outputs M-[ 2 7 ; 7 ; 9 5 is undefined

kitty: Works fine
kitty + tmux: Outputs M-[ 2 7 ; 7 ; 9 5 is undefined

I primarily use foot or alacritty because I’m on Wayland.

Regardless of the terminal, when I run `cat` in any of these shell/tmux
combinations, I get the same output: ^[^_.

Interestingly, these combinations work as expected:

foot + tmux + `TERM=foot emacs -nw`: Works fine
foot + tmux + `TERM=xterm emacs -nw`: Works fine

Given these mixed results, I’m unsure if the issue lies with Emacs,
tmux, or something in my configuration.

Any insights or suggestions would be greatly appreciated.

Thanks,
Ergus

Re: Issue with tmux update

[Olaf Rogalsky]

Ergus <spacibba@aol.com> writes:
> Given these mixed results, I’m unsure if the issue lies with Emacs,
> tmux, or something in my configuration.
>
> Any insights or suggestions would be greatly appreciated.
Probably related to the following changes in TMUX:

CHANGES FROM 3.4 TO 3.5

* Revamp extended keys support to more closely match xterm and support mode 2
  as well as mode 1. This is a substantial change to key handling which changes
  tmux to always request mode 2 from parent terminal, changes to an unambiguous
  internal representation of keys, and adds an option (extended-keys-format) to
  control the format similar to the xterm(1) formatOtherKeys resource.


Olaf

-- 
Olaf Rogalsky
Schwoerhausgasse 5
89073 Ulm
Germany