Test_terminal_tmap test failure in CI

[Yegappan Lakshmanan]

Hi,

The Test_terminal_tmap() test fails occasionally in the Linux GUI CI action:

https://github.com/vim/vim/runs/5817654101?check_suite_focus=true

I am not able to reproduce this failure in a local setup. I don't know where
it fails in that test. Is anyone else able to reproduce this failure?

Thanks,
Yegappan