better SIGWINCH handler

[Antoni Sawicki]

on modern systems resizeterm() should be called in sigwinch handler instead of endwin() && refresh()

on some systems getmaxyx doesn't work correctly, use TIOCGWINSZ instead see how old svr4 vi does it (ex_v.c)

[Antoni Sawicki]

moar https://stackoverflow.com/questions/1811955/ncurses-terminal-size

[Antoni Sawicki]

tried both, doesn't work 🤷