Bypass unknow test

Whatever condition this test check, it is not raising anymore.
Keep them until confirm they are obsolete.
avoid flush on resize

Since progress buffer is cleaned after every flush init(progress)
avoid to launch it on resize, which is invoked several times during operation
finishing with an empty ready buffer.
drop chars to ready buffer

Since flush cleans progress buffer, and it's called in several
operations, put characters directly to ready buffer
functional example

Create a functional example using put, bg and fg functions