RB.SourceSearch.is_subset

@accepts(utf8, utf8)
@returns(gboolean)
def do_is_subset(self, current, next):

Determines whether the new search text will result in a subset of entries matched by the previous search. This is used to optimise the search query.

current :

the current search text (or NULL if the current search was done with a different search implementation and so cannot be considered)

next :

the new search text

Returns :

TRUE iff the new search text will match a subset of those matched by the current search.