[XeTeX] Discretionary hyphens don't work in paragraphed footnotes

[Philip Taylor]

Peter Mukunda Pasedach wrote:

> You then get "hyphen-ateme", which is not among the list of possible
> hyphenation points I've specified.

Yes, I realised that after I had posted, which confused me enormously.
The presence of explicit discretionaries within a word is supposed to
inhibit normal word-breaking, so I have no idea what is going on ...

Philip Taylor