Pressing the "Show Inactive" button in the material instance editor did not display groups that did not contain the active parameter

//MaterialEditorInstanceDetailCustomization.cpp

// add_start (copied from MaterialEditingLibrary.cpp)
FMaterialInstanceEditor* FindMaterialInstanceEditorForAsset(UObject* InAsset)
{
	if (IAssetEditorInstance* AssetEditorInstance = (InAsset != nullptr) ? GEditor->GetEditorSubsystem<UAssetEditorSubsystem>()->FindEditorForAsset(InAsset, false) : nullptr)
	{
		// Ensure this is not a UMaterialInstanceDynamic, as that doesn't use FMaterialInstanceEditor as its editor
		if (!InAsset->IsA(UMaterialInstanceDynamic::StaticClass()))
		{
			return static_cast<FMaterialInstanceEditor*>(AssetEditorInstance);
		}
	}

	return nullptr;
}
// add_end

void FMaterialInstanceParameterDetails::CreateGroupsWidget(TSharedRef<IPropertyHandle> ParameterGroupsProperty, IDetailCategoryBuilder& GroupsCategory)
{
	bool bShowSaveButtons = false;
	check(MaterialEditorInstance);
	for (int32 GroupIdx = 0; GroupIdx < MaterialEditorInstance->ParameterGroups.Num(); ++GroupIdx)
	{
		FEditorParameterGroup& ParameterGroup = MaterialEditorInstance->ParameterGroups[GroupIdx];
		if (ParameterGroup.GroupAssociation == EMaterialParameterAssociation::GlobalParameter
			&& ParameterGroup.GroupName != FMaterialPropertyHelpers::LayerParamName)
		{
			bShowSaveButtons = true;
			bool bCreateGroup = false;
			for (int32 ParamIdx = 0; ParamIdx < ParameterGroup.Parameters.Num() && !bCreateGroup; ++ParamIdx)
			{
				UDEditorParameterValue* Parameter = ParameterGroup.Parameters[ParamIdx];
				const bool bIsVisible = MaterialEditorInstance->VisibleExpressions.Contains(Parameter->ParameterInfo);
				bCreateGroup = bIsVisible && (!MaterialEditorInstance->bShowOnlyOverrides || FMaterialPropertyHelpers::IsOverriddenExpression(Parameter));
			}

// add_start
			if (!bCreateGroup)
			{
				FMaterialInstanceEditor* MIE = FindMaterialInstanceEditorForAsset(MaterialEditorInstance->SourceInstance);
				if (MIE)
				{
					bool bShowHiddenParameters = false;
					MIE->GetShowHiddenParameters(bShowHiddenParameters);
					if (bShowHiddenParameters)
					{
						bCreateGroup = true;
					}
				}
			}
// add_end