Preview rendering works again for non-time-dependent nodes

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/Drawer/MaterialNodeDrawer.cs

 using System.Linq;
 using UnityEditor.Experimental.UIElements.GraphView;
 using UnityEditor.Graphing.Drawing;
+using UnityEditor.Graphing.Util;
 using UnityEngine.Graphing;
 using UnityEngine.MaterialGraph;
 using UnityEngine;
             {
                 data.OnModified(ModificationScope.Node);
                 UpdatePreviewTexture(m_currentPreviewData);
-                Dirty(ChangeType.Repaint);
             }
             ListPool<INode>.Release(childrenNodes);
         }
                 m_PreviewImage.RemoveFromClassList("inactive");
                 m_PreviewImage.image = texture;
             }
+            Dirty(ChangeType.Repaint);
         }
 
         void UpdateControls(MaterialNodePresenter nodeData)
-            m_ControlsContainer.ClearChildren();
+            if (controlPresenters.ItemsReferenceEquals(m_CurrentControlPresenter) && nodeData.expanded)
+                return;
+
+            m_ControlsContainer.Clear();
             m_CurrentControlPresenter.Clear();
 
             if (!nodeData.expanded)
             {
-                m_ControlsContainer.AddChild(CreateControl(controlData));
+                m_ControlsContainer.Add(CreateControl(controlData));
                 m_CurrentControlPresenter.Add(controlData);
             }
         }

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/Presenters/MaterialNodePresenter.cs

 using UnityEngine.Graphing;
 using UnityEngine.MaterialGraph;
 using UnityEditor.Experimental.UIElements.GraphView;
+using UnityEngine;
 
 namespace UnityEditor.MaterialGraph.Drawing
 {
+        [SerializeField]
+
+        [SerializeField]
+        int m_Version;
 
         public bool requiresTime
         {
 
         public override void OnModified(ModificationScope scope)
         {
+            m_Version++;
             base.OnModified(scope);
             // TODO: Propagate callback rather than setting property
             if (m_NodePreviewPresenter != null)
         public override void Initialize(INode inNode)
         {
             base.Initialize(inNode);
+            m_Version = 0;
             AddPreview(inNode);
         }
 

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/Presenters/NodePreviewPresenter.cs

             if (m_Node.hasPreview == false)
                 return null;
 
-            if (m_modificationScope != ModificationScope.Nothing)
+            var scope = m_modificationScope;
+            m_modificationScope = ModificationScope.Nothing;
+
+            if (scope != ModificationScope.Nothing)
-                if (m_modificationScope >= ModificationScope.Graph)
+                if (scope >= ModificationScope.Graph)
-                m_modificationScope = ModificationScope.Nothing;
             }
             else if (m_texture == null)
             {