Cursor stops blinking after entering vim/tmux

[mktange]

Hey. I just installed wsltty and noticed that whenever I enter a program such as vim or tmux, my cursor will stop blinking:

Any idea what could be causing this?

I am only seeing this happen when using wsltty. It works fine when running WSL normally, or even when running WSL via Git Bash's mintty/winpty.

Thanks in advance!

[mintty]

Which version of mintty do you run?
Probably duplicate of mintty/mintty#787.

[mktange]

The one under wsltty is 2.9.3, while the one under Git Bash (which works) is only 2.9.1:

mktange:~$ /mnt/c/Users/mtange/AppData/Local/wsltty/bin/mintty.exe --version
mintty 2.9.3 (x86_64-pc-cygwin) – wsltty 1.9.3
© 2013/2018 Andy Koppe / Thomas Wolff
License GPLv3+: GNU GPL version 3 or later
There is no warranty, to the extent permitted by law.

mktange:~$ /mnt/c/Program\ Files/Git/usr/bin/mintty.exe --version
mintty 2.9.1 (x86_64-pc-msys)
© 2013/2018 Andy Koppe / Thomas Wolff
License GPLv3+: GNU GPL version 3 or later
There is no warranty, to the extent permitted by law.

[mintty]

Please check which escape sequences your application uses as configured when starting, or make a terminal log (not screenshot) that includes the effect, so it can be reproduced with cat log.

[mktange]

Here is a log file of it happening. Doing cat log.txt makes the cursor stop blinking for me.

[mktange]

Tried doing cat log.txt in Git Bash as well, and it also made the cursor stop blinking. However, now this issue is now also happening when opening vim in Git Bash... not sure what has changed since I last tried it there, besides me restarting my computer.

Just to try something else, I tried opening the terminals in ConEmu, and here it currently still works correctly in Git Bash, but not wsltty. When doing cat log.txt it stops the cursor from blinking in wsltty, while with Git Bash it keeps blinking, but seems to partially mess up the terminal output.

[mintty]

The culprit is the CSI escape sequence ESC[?12l which is supported since 2.9.0, following xterm.
It is included in the terminfo "cnorm" sequence to reset the cursor. Somebody probably put it in there on purpose.

[mintty]

Actually, behaviour is identical in xterm; this is not a mintty issue, so I'm marking it invalid.
A workaround is already available: include option SuppressDEC=12 in your config file.
Maybe I'll add a specific hint to the wiki, leaving the issue open for now.

[mktange]

Awesome, that worked. Thank you for the fast troubleshooting and help!

[JonnyRa]

For anyone else who stumbles across this, I think this might be a neovim issue. I used it instead of normal vim to trial floobits recently, environment was gnome-shell + tmux. I lost cursor blink in my whole tmux session accross all panes and windows and restarting tmux had no effect... nvim had told me to muck around with some tmux settings so it took me a while to realise that it was also disabled in the parent terminal. Closing the parent terminal and reopening (+ not using neovim!) resolved the issue for me.

[mintty]

It also happens with non-neo vim. With most applications, it's not caused by the appliction itself but the underlying terminal library (often ncurses), as explained above.
Remedy also as explained above, and it's mentioned meanwhile in the wiki, so I'm closing the issue.

[mintty]

Actually there is one possible workaround that I've now implemented:
Blinking cursor mode (DECSET 12) effectively overlays blinking cursor style (DECSCUSR) so that DECRST 12 does not reset blinking but revert to the previous blinking style.

[mintty]

Released 3.0.1.