By setting a filter function on the @box one can decide dynamically
which of the children to show.
For instance, to implement a search function that only shows the
children matching the search terms.
The @filter_func will be called for each child after the call, and
it will continue to be called each time a child changes (via
[method@Gtk.FlowBoxChild.changed]) or when
[method@Gtk.FlowBox.invalidate_filter] is called.
Note that using a filter function is incompatible with using a model
(see [method@Gtk.FlowBox.bind_model]).
By setting a filter function on the @box one can decide dynamically which of the children to show.
For instance, to implement a search function that only shows the children matching the search terms.
The @filter_func will be called for each child after the call, and it will continue to be called each time a child changes (via [method@Gtk.FlowBoxChild.changed]) or when [method@Gtk.FlowBox.invalidate_filter] is called.
Note that using a filter function is incompatible with using a model (see [method@Gtk.FlowBox.bind_model]).