@Override
	protected void init() {
		goToService = tool.getService(GoToService.class);
		viewManagerService = tool.getService(ViewManagerService.class);
		if (viewManagerService == null) {
			throw new AssertException(
				"Program Tree Plugin could not find a " + "provider of the View Manager Service");
		}

		actionManager.clearSystemClipboard();
	}
Read the data for the plugin upon deserialization; reads what should be
the current selection in the tree.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/programtree/ProgramTreePlugin.java