Update litegraph.core.js

add node.ondrawn hook, allow canvas.onSelectionChange hook

web/lib/litegraph.core.js

@@ -5304,7 +5304,6 @@ LGraphNode.prototype.executeAction = function(action)
         this.onDrawOverlay = null; //to render foreground objects not affected by transform (for GUIs)
 		this.onDrawLinkTooltip = null; //called when rendering a tooltip
 		this.onNodeMoved = null; //called after moving a node
-		this.onSelectionChange = null; //called if the selection changes
 		this.onConnectingChange = null; //called before any link changes
 		this.onBeforeChange = null; //called before modifying the graph
 		this.onAfterChange = null; //called after modifying the graph
@@ -8840,6 +8839,9 @@ LGraphNode.prototype.executeAction = function(action)
         }
 
         ctx.globalAlpha = 1.0;
+
+        if (node.onDrawn)
+            node.onDrawn();
     };
 
 	//used by this.over_link_center