Prevented copying IOs nodes in subgraph

Author: williamchange

material_maker/nodes/ios/ios.gd

@@ -1,3 +1,4 @@
+class_name MMGraphNodeIOs
 extends MMGraphNodeGeneric
 
 func _ready():

material_maker/panels/graph_edit/graph_edit.gd

@@ -917,6 +917,8 @@ func serialize_selection(nodes = [], with_inputs : bool = false) -> Dictionary:
 	if nodes.is_empty():
 		for c in get_children():
 			if c is GraphElement and c.selected and c.name != "Material" and c.name != "Brush":
+				if generator != top_generator and c is MMGraphNodeIOs:
+					continue
 				nodes.append(c)
 	if nodes.is_empty():
 		return {}
@@ -942,6 +944,8 @@ func serialize_selection(nodes = [], with_inputs : bool = false) -> Dictionary:
 func can_copy() -> bool:
 	for c in get_children():
 		if c is GraphElement and c.selected and c.name != "Material" and c.name != "Brush":
+			if generator != top_generator and c is MMGraphNodeIOs:
+					return false
 			return true
 	return false