public void collapse() {
		GTree tree = getTree();
		if (tree != null) {
			tree.collapseAll(this);
		}
	}
Convenience method for collapsing (closing) this node in the tree. If this node is not
currently attached to a visible tree, then this call does nothing
Ghidra/Framework/Docking/src/main/java/docking/widgets/tree/GTreeNode.java