another UTF8 Problem in 21.4.17

[Aidan Kehoe]

 Ar an seachtú lá is fiche de mí Eanair, scríobh Stephen J. Turnbull>: 

 > I expect that XEmacs 21.5 will make very rapid progress in the next
 > few months, but this depends very much on Ben Wing, and of course will
 > be accompanied by substantial instability for a while.  Aidan Kehoe
 > also threatened to work on the "unknown characters problem", so that
 > may get done quickly even if Ben doesn't do it.  (I'd like to work on
 > it but I don't think I have time to be the lead.)

I’ve written a patch based on Mike Fabian’s suggestion (that is, dynamically
assign unknown Unicode code points on encountering them to a Mule character
set created ad-hoc), and have been running with it locally for months. I
haven’t integrated it, partly because Ben has been stating that he’ll get to
great things, and partly because it’s buggy in the escape-quoted
auto-save-file case. (The mapping from unknown code points to Mule character
codes is not stable from one invocation to the next.) 

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