Fire a "nodes" event when the selected node change
Fire a "nodes" event when the selected node change

When a external program change the SelectedNode property, we should
fire the "nodes" event to permit others watches to be notified.

townxelliot/the-graph,townxelliot/the-graph,mateioprea/the-graph,XurxoCid/the-graph,BassgLLC/the-graph,the-grid/the-graph,lxfschr/the-graph,djdeath/the-graph,yousefmoazzam/the-graph,the-grid/the-graph,oportocala/the-graph,mateioprea/the-graph,oportocala/the-graph,BassgLLC/the-graph,kelegorm/the-graph,XurxoCid/the-graph,yousefmoazzam/the-graph,mcanthony/the-graph,kelegorm/the-graph,mcanthony/the-graph,djdeath/the-graph,lxfschr/the-graph