Perviously, 'foo bar' would match 'foo/bar' but not 'bar/foo'. Now it
will match both, using a query with a WHERE clause like:
WHERE ((url || title) like '%foo%' AND (url || title) like '%bar%')
This does not seem to change the performance benchmark. However, it does
create a new query for every character added rather than re-running the
same query with different parameters. We could re-use queries if we
maintained a list like self._queries=[1_arg_query, 2_arg_query, ...].
However, it isn't clear that such a complexity would be necessary.
Resolves#1651.
8909e03f1c