void dispose() {
		reloadUpdateManager.dispose();
		incomingTree.dispose();
		outgoingTree.dispose();
		if (currentProgram != null) {
			currentProgram.removeListener(domainObjectListener);
			currentProgram = null;
		}

		recurseDepthAction.dispose();
		refreshAction.dispose();
		unifyFunctionsAction.dispose();
		filterNonCallsAction.dispose();
		navigationOutgoingAction.dispose();
		navigateIncomingAction.dispose();
	}
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