Re: BUG #15548: Unaccent does not remove combining diacritical characters

        Tom Lane wrote:

> Hm, I thought the OP's proposal was just to make unaccent drop
> combining diacriticals independently of context, which'd avoid the
> combinatorial-growth problem.

In that case, this could be achieved by simply appending the
diacriticals themselves to unaccent.rules, since replacement of a
string by an empty string is already supported as a rule.
It doesn't seem like the current file has any of these, but from
https://www.postgresql.org/docs/11/unaccent.html :

 "Alternatively, if only one character is given on a line, instances
 of that character are deleted; this is useful in languages where
 accents are represented by separate characters"