psql display of Unicode combining characters in 8.2

psql's display of Unicode combining characters appears to have
changed in 8.2. For example, I'd expect <U+006E LATIN SMALL LETTER N,
U+0303 COMBINING TILDE> to display the same as the precomposed
<U+00F1 LATIN SMALL LETTER N WITH TILDE>. With 8.1's psql they do,
but with 8.2's psql this sequence displays as:

SELECT E'n\314\203'; -- \314\203 = UTF-8 encoding of U+0303
?column?
----------
n\u0303
(1 row)

(I'm testing with both server and client using UTF-8.)

This excerpt from pg_wcsformat() in mbprint.c looks responsible:

else if (w <= 0) /* Non-ascii control char */
{
if (encoding == PG_UTF8)
sprintf((char *) ptr, "\\u%04X", utf2ucs(pwcs));

This might be the relevant commit:

http://archives.postgresql.org/pgsql-committers/2006-02/msg00089.php

Should the code distinguish between combining characters and
zero-width control characters so the former display correctly?

--
Michael Fuhr