[Port] [6000.3] [SG] Fixes for Node Preview Preferences issues

Author: svc-reach-platform-support

Packages/com.unity.shadergraph/Editor/Data/Graphs/GraphData.cs

@@ -698,7 +698,7 @@ public void ClearChanges()
             m_MovedContexts = false;
         }
 
-        public void AddNode(AbstractMaterialNode node)
+        public void AddNode(AbstractMaterialNode node, bool usePreviewPref = true)
         {
             if (node is AbstractMaterialNode materialNode)
             {
@@ -708,7 +708,8 @@ public void AddNode(AbstractMaterialNode node)
                     return;
                 }
 
-                materialNode.previewExpanded = ShaderGraphPreferences.newNodesPreview;
+                if (usePreviewPref && materialNode.UsePreviewPref)
+                    materialNode.previewExpanded = ShaderGraphPreferences.newNodesPreview;
 
                 AddNodeNoValidate(materialNode);
 
@@ -2301,7 +2302,7 @@ internal void PasteGraph(CopyPasteGraph graphToPaste, List<AbstractMaterialNode>
                 }
 
                 remappedNodes.Add(pastedNode);
-                AddNode(pastedNode);
+                AddNode(pastedNode, false);
 
                 // add the node to the pasted node list
                 m_PastedNodes.Add(pastedNode);

Packages/com.unity.shadergraph/Editor/Data/Nodes/AbstractMaterialNode.cs

@@ -43,6 +43,8 @@ abstract class AbstractMaterialNode : JsonObject, IGroupItem, IRectInterface
 
         internal virtual bool ExposeToSearcher => true;
 
+        internal virtual bool UsePreviewPref => true;
+
         protected virtual bool CanPropagateFloatLiteral => false;
 
         OnNodeModified m_OnModified;

Packages/com.unity.shadergraph/Editor/Data/Nodes/Utility/PreviewNode.cs

@@ -8,6 +8,8 @@ class PreviewNode : CodeFunctionNode
     {
         public override bool hasPreview { get { return true; } }
 
+        internal override bool UsePreviewPref => false;
+
         protected override bool CanPropagateFloatLiteral => true;
 
         [SerializeField]