environment: improve the TTY check (#1785)
Bug report from @qosmio: https://github.com/sorin-ionescu/prezto/pull/1771#issuecomment-575596417 I'm unable to reproduce it and @qosmio hasn't yet confirmed or disconfirmed whether this fix works. It's a good idea to change the code this way in either case. (As I mentioned in #1771, this `stty -ixon` call may have been added by mistake. It doesn't do what the comment suggest and is at least as likely to be harming users as helping them.)main
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