ERROR: syntax error in tsquery - for high-unicode whitespace

hi
it was tested on 9.1 and 9.3. Interestingly - it worked without error in
8.2.

$ select to_tsquery('english', E'a\xe2\x80\x86a');
ERROR:  syntax error in tsquery: "a a"

the 3-byte utf8 character is SIX-PER-EM SPACE (based on info from
http://www.fileformat.info/info/unicode/char/2006/index.htm)

Not sure what should happen with it, but generally I thought that
whitespace characters will get ignored (treated as separators) when
building tsquery.

It seems to work that way when building tsvector though:

$ select to_tsvector('english', E'a\xe2\x80\x86a');
 to_tsvector
-------------

(1 row)

and for larger example:

$ select to_tsvector('english', E'depesz\xe2\x80\x86whatever');
      to_tsvector
-----------------------
 'depesz':1 'whatev':2
(1 row)

$ select to_tsquery('english', E'depesz\xe2\x80\x86whatever');
ERROR:  syntax error in tsquery: "depesz whatever"

Best regards,

depesz

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