public boolean isBusy() {
		return worker.isBusy();
	}
Passing a value of <code>false</code> signals to disable the {@link JTree}'s default behavior
of showing handles for leaf nodes until they are opened.

@param enable False to disable the default JTree behavior
Ghidra/Framework/Docking/src/main/java/docking/widgets/tree/GTree.java