GtkCustomFilterFunc

gboolean
(* GtkCustomFilterFunc) (
  GObject* item,
  gpointer user_data
)

User function that is called to determine if the item should be matched.

If the filter matches the item, this function must return TRUE. If the item should be filtered out, FALSE must be returned.

`item`	`GObject`
	The item to be matched.
	The data is owned by the caller of the function.
`user_data`	`gpointer`
	User data.
	The argument can be `NULL`.
	The data is owned by the caller of the function.

Returns:	`gboolean`
	`TRUE` to keep the item around.