Normalise Tai Tham or not?

Tue Oct 10 14:46:20 CDT 2017

> Date: Tue, 10 Oct 2017 20:00:12 +0100
> From: Richard Wordingham via Unicode <unicode at unicode.org>
> 
> 4) The pressure on search tools to respect canonical equivalence is now
> relatively low. Some editors do (e.g. LibreOffice); others don't (e.g
> Emacs, so far as I am aware).

Emacs lately introduced character-folding in searches, but it's turned
off by default, as many users objected.