[NTG-context] Is rendering furigana over horizontal or vertical japanese text doable in ConTeXt?

[黄复雄]

> I noticed an issue with multiple glyphs but am not sure why ... (so we
> need very small examples to figure it out).

I have observed a phenomenon that
when the base text contains glues/spaces, an error occurs,
as in the following example. Coincidentally, when using \setscript[hanzi],
the macro will inject glue between Chinese, and I will get the same error.

%%%begin example
\starttext
\ruby{a a}{b}
\stoptext
%%%end example

Best Regards,
                                      黄复雄（Huang Fuysong）
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