fix undo/redo with layeredLit

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Editor/LitUI.cs

             if (!heightMap[layerIndex].hasMixedValue && heightMap[layerIndex].textureValue != null)
             {
                 EditorGUI.indentLevel++;
+                EditorGUI.BeginChangeCheck();
-                heightAmplitude[layerIndex].floatValue = (heightMax[layerIndex].floatValue - heightMin[layerIndex].floatValue) * 0.01f; // Conversion centimeters to meters.
+                if (EditorGUI.EndChangeCheck())
+                {
+                    heightAmplitude[layerIndex].floatValue = (heightMax[layerIndex].floatValue - heightMin[layerIndex].floatValue) * 0.01f; // Conversion centimeters to meters.
+                }
                 m_MaterialEditor.ShaderProperty(heightCenter[layerIndex], Styles.heightMapCenterText);
                 EditorGUI.showMixedValue = false;
                 EditorGUI.indentLevel--;
             W = (uvBaseMapping == UVBaseMapping.UV3) ? 1.0f : 0.0f;
 
             UVMappingMask[layerIndex].colorValue = new Color(X, Y, Z, W);
+
+            EditorGUI.BeginChangeCheck();
-
-            // Precompute.
-            InvTilingScale[layerIndex].floatValue = 2.0f / (Mathf.Abs(baseColorMap[layerIndex].textureScaleAndOffset.x) + Mathf.Abs(baseColorMap[layerIndex].textureScaleAndOffset.y));
-            if ((uvBaseMapping == UVBaseMapping.Planar) || (uvBaseMapping == UVBaseMapping.Triplanar))
+            if (EditorGUI.EndChangeCheck())
-                InvTilingScale[layerIndex].floatValue = InvTilingScale[layerIndex].floatValue / TexWorldScale[layerIndex].floatValue;
+                // Precompute.
+                InvTilingScale[layerIndex].floatValue = 2.0f / (Mathf.Abs(baseColorMap[layerIndex].textureScaleAndOffset.x) + Mathf.Abs(baseColorMap[layerIndex].textureScaleAndOffset.y));
+                if ((uvBaseMapping == UVBaseMapping.Planar) || (uvBaseMapping == UVBaseMapping.Triplanar))
+                {
+                    InvTilingScale[layerIndex].floatValue = InvTilingScale[layerIndex].floatValue / TexWorldScale[layerIndex].floatValue;
+                }
             }
 
             EditorGUI.indentLevel--;
             // TODO: display warning if we don't have bent normal (either OS or TS) and ambient occlusion
             //if (enableSpecularOcclusion.floatValue > 0.0f)
             {
-                //EditorGUILayout.HelpBox(Styles.specularOcclusionWarning.text, MessageType.Error);                
+                //EditorGUILayout.HelpBox(Styles.specularOcclusionWarning.text, MessageType.Error);
-            EditorGUI.indentLevel++;            
+            EditorGUI.indentLevel++;
             m_MaterialEditor.TexturePropertySingleLine(Styles.emissiveText, emissiveColorMap, emissiveColor);
             m_MaterialEditor.ShaderProperty(emissiveIntensity, Styles.emissiveIntensityText);
             m_MaterialEditor.ShaderProperty(albedoAffectEmissive, Styles.albedoAffectEmissiveText);