From de97d7eb05ae6c00c85fc97afbe2d36fbf7a14af Mon Sep 17 00:00:00 2001
From: Thomas Madlener <thomas.madlener@desy.de>
Date: Mon, 20 Apr 2026 13:58:32 +0200
Subject: [PATCH] Include the containerName into the layerName if present

Avoids name clashes that otherwise occur when using the same group-by
logic in several sub-detectors.
---
 Core/include/Acts/Geometry/detail/BlueprintBuilder_impl.hpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Core/include/Acts/Geometry/detail/BlueprintBuilder_impl.hpp b/Core/include/Acts/Geometry/detail/BlueprintBuilder_impl.hpp
index 1e2f39c5220..a3a50951c9c 100644
--- a/Core/include/Acts/Geometry/detail/BlueprintBuilder_impl.hpp
+++ b/Core/include/Acts/Geometry/detail/BlueprintBuilder_impl.hpp
@@ -421,6 +421,9 @@ SensorLayerAssembler<BackendT>::build() const {
     }
     LayerSpec layerSpec = m_layerSpec;
     layerSpec.layerName = group.key;
+    if (m_containerName.has_value()) {
+      layerSpec.layerName = m_containerName.value() + "|" + group.key;
+    }
     auto layer = m_builder->makeLayer(std::span<const Element>{group.sensors},
                                       layerSpec);
     layer->setLayerType(m_layerType.value());