Suggestion: use stderr for I/O, or make it configurable about picotui HOT 3 OPEN

Thanks for the feedback and suggestion. I'll keep it in mind, but arguments for doing it like that would be that it's customary to do it at all. Do other TUI applications do it like that? Does curses lib do it like that by default?

As a random quick test, I tried Midnight Commander with:

mc >/dev/null

That doesn't produce any output, so it clearly does TUI operations on stdout.

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I agree, by very nature TUI must interact with console. Most likely, there are no conventions on FD usage for TUI.
In shell, FD 0 and 1 can participate in pipe, and 2 cannot be piped, and supposed to be attached to "debug console".
Anyway, if you would just introduce constants FD_IN=0 and FD_OUT=1, so that it behaves the same way and give the possibility to modify them and attach to different FD - that would be really nice

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Anyway, if you would just introduce constants FD_IN=0 and FD_OUT=1

I'll keep that in mind. I have a queue of things I'd like to do, including to that part of the code, so it may need to wait some time, but I'm not against it in principle.

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