Bidi paragraph direction in terminal emulators

[Eli Zaretskii via Unicode]

> From: Egmont Koblinger <egmont at gmail.com>
> Date: Thu, 7 Feb 2019 18:12:37 +0100
> Cc: Richard Wordingham <richard.wordingham at ntlworld.com>, 
> 	unicode Unicode Discussion <unicode at unicode.org>
> 
> I believe it's not my mental model that's weird, but your use of
> terminology that doesn't match UBA's that confused me.

Well, let's just say that Emacs uses the HL1 rule, and determines the
base direction for the entire chunk of text between empty lines.