bug#50177: Support U+20DD COMBINING ENCLOSING CIRCLE

[積丹尼 Dan Jacobson]

>>>>> "EZ" == Eli Zaretskii <eliz@gnu.org> writes:
>> How do
>> 檢⃝  x⃝
>> look to you?

EZ> Look correctly: as a single grapheme cluster.

EZ> You need a font that has glyphs for both the character and the circle.
EZ> Emacs can only compose character glyphs from the same font.

OK, it's a deal. On debian what package can I install to prove your theory?