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zle .redisplay sometimes eating up a line



Hello,
I have a problem where a .redisplay call done from a zle -F callback
eats up a previous line of text in the terminal. There it happens with
100% accuracy, always. When trying to reproduce it happens
occasionally, as recorded in the following video:

https://asciinema.org/a/257379

(it's using function:
https://gist.github.com/psprint/f2a0db07cc80351e19e30378c6eaa779)

I wonder what might be the cause? I recall that there are messages
appearing on a regular basis on a prompt eating up the last line of
the display. Maybe the issues are related?

-- 
Sebastian Gniazdowski
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