Closing this bug since I did not receive an adverse opinion in a week.
Andreas
The progress bar has been revamped since this bug was submitted, and the
original problem is solved.
On a very narrow terminal, lines may still be printed repeatedly, but anyway
there is a problem then to display all information legibly.
I think that this bug report can safely be closed, but wait
As reported on #guix by user ilit, when the terminal is very narrow, the
download progress line is constantly reprinted, as in this excerpt:
$ guix build -S libreoffice
substitute: warning: failed to install locale: Invalid argument
The following file will be downloaded:
/gnu/store/yv821gn5z48g