bug#57072: [BUG] update-glyphless-char-display and variation selectors

[Robert Pluim <rpluim@gmail.com>]

>>>>> On Fri, 12 Aug 2022 15:46:58 +0300, Eli Zaretskii <eliz@gnu.org> said:

    >> From: Axel Svensson <svenssonaxel@gmail.com>
    >> Date: Fri, 12 Aug 2022 13:51:21 +0200
    >> Cc: 57072@debbugs.gnu.org
    >> 
    >> > Why do you think including VS1 through VS14 is a mistake?
    >> It appears like blocks.awk somehow designates VS1 through VS14 for
    >> emoji use, while the Unicode standard per [1] and [5] above seem to
    >> exclude them from emoji use. I am not sure whether VS1 through VS14, or
    >> VS17 through VS256 need to be designated to some other script by
    >> blocks.awk.

    Eli> So you are saying that we should exclude VS1 through VS14 from the
    Eli> Emoji script?

    Eli> Robert, do you remember why we included them in the script?

Hmm. Ignorance on my part seems the most likely explanation. VS1-14
are not used for emoji/text presentation selection, so we should
probably just fix blocks.awk

    Eli> As for VS17 and above, I'm not sure we should assign them to any
    Eli> script.  Perhaps to Han?

What problems are caused by them not having a script? The composition
rules for them with Han codepoints work now, no?

Robert
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