on windows: if the term is resized when ReadString is being called and no one is reading form ws, we get a panic: send on closed channel.
It could make sense to poll getconsolescreenbufferinfo calls instead of this:
something started from the sigwinch() func
on unix: same story, sigwinch was listened upon by default but if the
signals (chan sends) were not handled, this could cause a crash
fix#7434