Prevent control key pass-through when docker is running #326
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Prior to this patch we assumed vim would always run on the host system, but docker containers have their own instances of /dev/pts/*, so if vim in say /dev/pts/N was running in tmux which was in a docker container, then we thought vim was running in /dev/pts/N on the host system which caused control keys calls to pass-through as send-keys rather than select-pane on the host system.