Chaotic output if the console's height is less then the number of threads

[ppalaga]

I got a new machine with 24 threads which leads to a funny consequence:

When mvnd is run in a console window with less rows than the number of threads, then the output is very chaotic. The updates appear on random places of the terminal. It is surely reproducible also on machines withe less threads, if the console window is made small enough.

This is just a UI issue. The build works correctly otherwise.