Add support for TMUX passthrough for emotes

[Nogesma]

Emotes should now work inside tmux if the underlying terminal is kitty.
If the terminal is not kitty, it will still send the emotes to the terminal and break stuff like this:

Maybe there should be a warning somewhere if we're running inside tmux?

The gp! macro is a bit messy now, let me know if you have a better way of doing this.

Fixes #685.

[Xithrius]

Haven't been able to think of a better way to go about the gp macro as of now. Alongside that, this is me running tmux inside kitty, with emotes enabled. What does it look like from your end, and were there any extra steps besides doing tmux inside kitty and running this change?

[Nogesma]

Hmm that's weird, for me it works fine. Maybe check if the TMUX env variable is set inside tmux, as that's how the check works. Otherwise I don't really know.
I'm using kitty 0.42.2 and tmux 3.5_a.

[Xithrius]

I'm using the same versions. the TMUX env var within tmux is usually set to something along the lines of /tmp/tmux-1000/default,895720,0. I might have set something incorrectly in my kitty config at some point.

[Xithrius]

@Nogesma do you have any config settings for tmux/kitty that you may have modified previously? If not then I'll probably create a VM in order to attempt to see if it works in a fresh environment.

[Nogesma]

Sorry for not responding, I was a bit busy. I tried it on another computer and it doesn't work, I'll try to see why tomorrow. Hopefully it's the same issue as you and I can fix it.

[Xithrius]

No problem, I too was busy IRL since my last comment. Thanks for taking a look into this. I would assume it's a config issue, but I have nothing to back that up with.

[Xithrius]

@Nogesma Hey, you get a chance to look at this?