Andrew Borodin 3c4fe21108 Ticket #4019: fix SIGWINCH handling,
Fix regression introduced in 37ffc024225fd2ef1016babf3cbbeabce4a32899.

(tty_got_winch): don't read FIFO, just check whether it os empty or not.
It can be called many times without lost of info about SIGWINCH raises.
(tty_flush_winch): read from FIFO to make it empty.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>
2019-09-29 11:21:14 +03:00
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