Creates a new filter using the given match_func to filter items.
If match_func is null, the filter matches all items.
If the filter func changes its filtering behavior, gtk.filter.Filter.changed needs to be called.
function to filter items
a new gtk.custom_filter.CustomFilter
Creates a new filter using the given match_func to filter items.
If match_func is null, the filter matches all items.
If the filter func changes its filtering behavior, gtk.filter.Filter.changed needs to be called.