bug#39799: 28.0.50; Most emoji sequences don’t render correctly

[Robert Pluim]

>>>>> On Fri, 28 Feb 2020 22:16:21 +0200, Eli Zaretskii <eliz@gnu.org> said:

    >> One thing though: the code currently does set-char-table-range to a
    >> new value. Is there a chance that an entry already exists in
    >> composition-function-table for a particular character?

    Eli> Only if the non-leading character is a combining character, which I
    Eli> think is unlikely.  But in general, yes, this should be tested up
    Eli> front to avoid losing composition rules.

OK, Iʼll take that into account.

Robert