Material component property inspector indicator changes

Shows indicator icon for differences between the overrides and the active material asset, not the material type.
So, the indicator will only be shown for property changes that have an effect and will be stored in the component.

Signed-off-by: Guthrie Adams <guthadam@amazon.com>

Gems/AtomLyIntegration/CommonFeatures/Code/Source/Material/EditorMaterialComponentInspector.cpp

@@ -314,12 +314,21 @@ namespace AZ
 
                             AtomToolsFramework::ConvertToPropertyConfig(propertyConfig, propertyDefinition);
 
+                            const auto& propertyIndex =
+                                m_editData.m_materialAsset->GetMaterialPropertiesLayout()->FindPropertyIndex(propertyConfig.m_id);
+
                             propertyConfig.m_groupName = groupDisplayName;
-                            const auto& propertyIndex = m_editData.m_materialAsset->GetMaterialPropertiesLayout()->FindPropertyIndex(propertyConfig.m_id);
                             propertyConfig.m_showThumbnail = true;
-                            propertyConfig.m_defaultValue = AtomToolsFramework::ConvertToEditableType(m_editData.m_materialTypeAsset->GetDefaultPropertyValues()[propertyIndex.GetIndex()]);
-                            propertyConfig.m_parentValue = AtomToolsFramework::ConvertToEditableType(m_editData.m_materialTypeAsset->GetDefaultPropertyValues()[propertyIndex.GetIndex()]);
-                            propertyConfig.m_originalValue = AtomToolsFramework::ConvertToEditableType(m_editData.m_materialAsset->GetPropertyValues()[propertyIndex.GetIndex()]);
+
+                            propertyConfig.m_defaultValue = AtomToolsFramework::ConvertToEditableType(
+                                m_editData.m_materialTypeAsset->GetDefaultPropertyValues()[propertyIndex.GetIndex()]);
+
+                            // There is no explicit parent material here. Material instance property overrides replace the values from the
+                            // assigned material asset. Its values should be treated as parent, for comparison, in this case.
+                            propertyConfig.m_parentValue = AtomToolsFramework::ConvertToEditableType(
+                                m_editData.m_materialAsset->GetPropertyValues()[propertyIndex.GetIndex()]);
+                            propertyConfig.m_originalValue = AtomToolsFramework::ConvertToEditableType(
+                                m_editData.m_materialAsset->GetPropertyValues()[propertyIndex.GetIndex()]);
                             group.m_properties.emplace_back(propertyConfig);
                         }
                     }