Adds rule to a filter that allows files based on a custom callback
function. The bitfield needed which is passed in provides information
about what sorts of information that the filter function needs;
this allows GTK+ to avoid retrieving expensive information when
it isn't needed by the filter.
Since 2.4
Adds rule to a filter that allows files based on a custom callback function. The bitfield needed which is passed in provides information about what sorts of information that the filter function needs; this allows GTK+ to avoid retrieving expensive information when it isn't needed by the filter. Since 2.4