Prints what the matcher is matching against. The format will be
equal to the format passed to g_file_attribute_matcher_new().
The output however, might not be identical, as the matcher may
decide to use a different order or omit needless parts.
Available since: 2.32
Return value
Type:char*
A string describing the attributes the matcher matches
against or NULL if matcher was NULL.
The caller of the method takes ownership of the returned data, and is responsible for freeing it.