@Override
		public void run(TaskMonitor monitor) throws CancelledException {
			CallNode rootNode = (CallNode) tree.getModelRoot();
			List<GTreeNode> children = rootNode.getChildren();
			for (GTreeNode node : children) {
				updateFunction((CallNode) node);
			}
		}
A variable used to restrict open-ended operations, like expanding all nodes or filtering.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/calltree/CallTreeProvider.java