In message <20170718205700.GA2131@hades.panopticon>, Dmitry Marakasov writes:

>In short, when FreeBSD ports options dialog is interrupted by Ctrl+C,
>there's chance of sporadic terminal corruption. They are not always
>reproducible and seem to be dependent on a machine, shell, terminal,
>tmux used, but are not tied to any specific configuration.

I've noticed another quirk which may be related:

Start vi(1) on some file.

        !some_command_producing_significant_output | less


This leaves the less(1) alive and competing vi(1) for the terminal
in a most unworkable and annoying fashion.

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
p...@freebsd.org         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.
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