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 data, and is responsible for freeing it.