public FSBNode getSelectedNode() {
		List<FSBNode> selectedNodes = getSelectedNodes();
		return selectedNodes.size() == 1 ? selectedNodes.get(0) : null;
	}
Returns the currently selected tree node

@return the currently selected tree node, or null if no nodes or more than 1 node is selected
Ghidra/Features/Base/src/main/java/ghidra/plugins/fsbrowser/FSBActionContext.java