Calls the given function for each of the key/value pairs in the #GTree.
The function is passed the key and value of each pair, and the given
@data parameter. The tree is traversed in sorted order.
The tree may not be modified while iterating over it (you can't
add/remove items). To remove all items matching a predicate, you need
to add each item to a list in your #GTraverseFunc as you walk over
the tree, then walk the list and remove each item.
Calls the given function for each of the key/value pairs in the #GTree. The function is passed the key and value of each pair, and the given @data parameter. The tree is traversed in sorted order.
The tree may not be modified while iterating over it (you can't add/remove items). To remove all items matching a predicate, you need to add each item to a list in your #GTraverseFunc as you walk over the tree, then walk the list and remove each item.