private DR findNext() {
				while (true) {
					DBTreeRecord<?, ? extends NS> rec = queue.poll();
					if (rec == null) {
						return null;
					}
					if (query != null && query.terminateEarlyNode(rec.getBounds())) {
						return null;
					}
					if (rec instanceof DBTreeDataRecord) {
						@SuppressWarnings("unchecked")
						DR dr = (DR) rec;
						if (query != null && !query.testData(dr.getShape())) {
							continue;
						}
						return dr;
					}
					assert rec instanceof DBTreeNodeRecord;
					@SuppressWarnings("unchecked")
					NR nr = (NR) rec;
					if (query != null && query.testNode(nr.getShape()) != QueryInclusion.NONE) {
						descend(nr);
					}
					continue;
				}
			}
Called when a node is finished being visited.

This only applies to nodes into which the visitor descends. The visitor will finish a
node in one of three ways: 1) The node's children have all been visited. 2) The visitor
returned {@link VisitResult#TERMINATE} while visiting a descendant. 3) The visitor
returned {@link VisitResult#ASCEND} while visiting a child.

This method may return any result except {@link VisitResult#DESCEND}. If the visitor is
terminating, the return value of this method is ignored.

@param parent the parent of this node, or {@code null} when visiting the root
@param n the node currently being visited
@param inclusion the original inclusion of the query before descending
@return a directive for how the visitor should proceed
Ghidra/Debug/ProposedUtils/src/main/java/ghidra/util/database/spatial/AbstractConstraintsTree.java