SC2059 (info): Don't use variables in the printf format string. Use printf '..%s..' "$foo".
Which is hard(er) because the sequences are not interpreted unless they
are in the format string.
Signed-off-by: Fini Jastrow <ulf.fini.jastrow@desy.de>
A more conceise version of the Powerline test, designed to show
the dreaded 'faint vertical lines' phenomenon from LCD antialiasing
Signed-off-by: Fini Jastrow <ulf.fini.jastrow@desy.de>
