This is a practice of tree list with Gtk4 and Rust which can be reorderable by drag and drop.
When the node is dropped on the top half of the expander, the node becomes a parent with that expander's node as a neighbor. On the other hand, on the lower half, the node becomes a neighbor of the expander's node.
When the node is dropped on the top half of the label, the node becomes a parent with that label's node as a neighbor. On the other hand, on the lower half, the node becomes a child of the label's node.
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dump: prints the tree data structure to standard output
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update: redraw tree
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add(n): add a neighbor to the selected node
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add(c): add a child to the selected node
