`tl` doesn't exit gracefully (and hangs if called from inside another terminal UI)

[Roobxyz]

OK bear with me here - I wanted to use this to view kubernetes pod logs, easy:

kubectl logs job-123 -f | tl

Except most of my time in kubernetes is spent using k9s
And k9s offers the ability to write custom plugins

So I thought, I'll bind Ctrl-L in k9s to kc log job-123 | tl and I'll have much better logging!

However due to the way tl handles quitting, k9s hangs whenever I Ctrl-C tl.
I then have to SIGKILL everything in order to get my terminal back...

It would be really cool if there was a way to more elegantly quit (which I suspect would fix this) or if the handling around SIGINT was a improved.

[Roobxyz]

Attempted to close with Roobxyz:issue59

[HryGan404]

I have the same problem, tl doesn't exit gracefully when using pipe, easily like:

ls | tl

Then I use Ctrl + C to quit tl, tl quitted but when I move my mouse, my terminal shows like this:

I tried to fix it by using your code in the pull request, but it doesn't work for me.

However I find that if you use sys.exit(0) to exit tl instead of using sys.stderr.write("^C") with "TEXTUAL_ALLOW_SIGNALS": "1" in env, this env doesn't seem to be needed anymore? I remove this env and my problem solved.

I'm a beginner of English and Python, hope my expression is clear and my understandings is right.