New icons do not render properly in tmux

[ayamir]

Discussed in #720

^{Originally posted by AngelontheRoad May 7, 2023}
I just merged #447 and updated all plugins. I tried to use the new nerd font with Mono and Propo and everything works perfectly without tmux. But inside tmux I found that icons were not rendered properly.

inside tmux:

outside tmux is OK:

I found a reddit post that has a similar problem, but no solution works for me.

By the way, I noticed that icons baseline is not a straight line (marked above).😥

Is there any help? Thanks

[ayamir]

Occurs on zellij too. Maybe has to do with environment variables.

[ayamir]

Have no idea about it now.

[AngelontheRoad]

According to the issue posts in wezterm and tmux, the render problem may caused by ConPTY which used only in Windows system. I don't know if this is a problem in a real linux box.

As mentioned in the post, ssh is a feasible way to bypass ConPTY. B/C alacritty is not a multiplexier, I tried in wezterm and it rendered OK.

Steps:

1. set systemd=true under /etc/wsl.conf [boot]
2. download openssh in wsl2.
3. shutdown wsl2 by wsl --shutdown
4. uncomment or add below in /etc/ssh/sshd_config (Port number larger than 1000 is recommended)

Port 2222
ListenAddress 0.0.0.0  
PasswordAuthentication yes
PubkeyAuthentication yes
PasswordAuthentication yes
AcceptEnv LANG LC_*

5. if using Ubuntu-22.*, set ListenStream=2222 in /lib/systemd/system/ssh.socket
6. restart ssh service by sudo systemctl restart ssh
7. get wsl2 IP address by wsl hostname -I
8. establish ssh connection by wezterm ssh username@ip:2222. If ssh key exists, use wezterm ssh -oIndentityFile='~/.ssh/yoursshkey' username@ip:2222. But I recommend to set ssh_domains in wezterm configuration file.

Summary

In general, this solution may be effective for solving render problems that exist only in wsl (such as undercurl) unless microsoft updates ConPTY. In my short using experience, the only bug is that spawning a new cmd or powershell tab in ssh window will crash wezterm. I don't know how it works in other terminals. IMHO, wsl users who rely on tmux but hate trivial settings, use wezterm straightly is a better choice

[ayamir]

According to the issue posts in wez/wezterm#3704 and tmux/tmux#3566, the render problem may caused by wez/wezterm#3704 (comment) which used only in Windows system.

Indeed, it doesn't occur on my gentoo linux.

[ayamir]

The latest(20230712-072601-f4abf8fd) wezterm has solved this issue natively, no need to use ssh to connect wsl.