Strange characters appeared when entering Tmux

[hexh250786313]

Environment

Windows build number: Microsoft Windows [ver 10.0.19041.508]
Your Distribution version: Ubuntu 20.04
Whether the issue is on WSL 2 and/or WSL 1: WSL 2
Tmux ver: tmux next-3.3

Steps to reproduce

1. On WSL 2
2. Create a new session on tmux. I execute: tmux new -s test, then enter the session.
3. Or attach an old session: tmux attach -t test

Expected behavior

no strange characters

Actual behavior

There are some strange characters appeared before the cursor. They are 0;10;1c. Like this:

But it didn't always happen. This is a chance event.

[hexh250786313]

And it happened in both my desktop and laptop.

[hexh250786313]

And it didn't happened in WSL 1. But my WSL 1 is Ubuntu 18.04. I'm not sure this is related to the Linux version or the WSL version.

[hexh250786313]

Ok, I finally resolved it. It happened when tmux run on Ubuntu 20.04. When your .tmux.conf has the line set -sg escape-time 0, it happens.

On Ubuntu 18.04, I add this line because there is a delay when I press Esc key. But if I add the line set -sg escape-time 0 on 20.04, The strange characters appear. I think it is because of the 0s. Finally I change it to 50ms (500ms default).

So I just need to change the line to set -sg escape-time 50 on 20.04 and issue resolved.

[kcking]

Ok, I finally resolved it. It happened when tmux run on Ubuntu 20.04. When your .tmux.conf has the line set -sg escape-time 0, it happens.

On Ubuntu 18.04, I add this line because there is a delay when I press Esc key. But if I add the line set -sg escape-time 0 on 20.04, The strange characters appear. I think it is because of the 0s. Finally I change it to 50ms (500ms default).

So I just need to change the line to set -sg escape-time 50 on 20.04 and issue resolved.

Thank you for reporting your solution! This fixed my issue as well, I was also seeing 0;10;1c on tmux start (using wezterm and tmux on wsl2 debian).

[kchen0x]

It helps!

[roachsinai]

Seems it works only for the first time start a Session, if you exit current session and run tmux again, prints chars again.

Originally posted by @roachsinai in tmux-plugins/tmux-sensible#61 (comment)

[trallnag]

For me only thing that fixed the characters appearing was placing set -g escape-time 50 right at the beginning of my tmux.conf before using run-shell to source a shell script that contains the bulk of my configuration.

tmux-plugins/tmux-sensible#61 (comment)