I found this too and while I don't really understand how this test ever passes, I have a proposed fix upstream: https://github.com/urwid/urwid/pull/238 which I have just uploaded to ubuntu
I found this too and while I don't really understand how this test ever passes, I have a proposed fix upstream: https://github.com/urwid/urwid/pull/238 which I have just uploaded to ubuntu