[VFX] Prevent from changing any template information in the inspector during the play mode

Author: julienamsellem

Packages/com.unity.shadergraph/Editor/Importers/ShaderGraphImporterEditor.cs

@@ -140,6 +140,7 @@ GraphData GetGraphData(AssetImporter importer)
                 GUIUtility.systemCopyBuffer = generator.generatedShader;
             }
 
+            EditorGUI.BeginDisabled(EditorApplication.isPlaying);
             EditorGUILayout.Space();
             EditorGUI.BeginChangeCheck();
             EditorGUILayout.PropertyField(serializedObject.FindProperty(ShaderGraphImporter.UseAsTemplateFieldName));
@@ -155,6 +156,7 @@ GraphData GetGraphData(AssetImporter importer)
                 EditorGUILayout.PropertyField(serializedObject.FindProperty(ShaderGraphImporter.TemplateFieldName));
                 needsSaveMetaFile |= EditorGUI.EndChangeCheck();
             }
+            EditorGUI.EndDisabled();
 
             if (materialEditor)
             {

Packages/com.unity.visualeffectgraph/Editor/Inspector/VFXAssetEditor.cs

@@ -660,6 +660,7 @@ public override VisualElement CreateInspectorGUI()
             header.AddToClassList("inspector-header");
             header.focusable = false;
             root.Add(header);
+            header.enabledSelf = !EditorApplication.isPlaying;
 
             var allImportersSerializedObject = new SerializedObject(importers.ToArray());
             var useAsTemplateProperty = allImportersSerializedObject.FindProperty("m_UseAsTemplate");