From 7718c45c38a418450725b24b1a436398823f93dd Mon Sep 17 00:00:00 2001
From: Goetz Gaycken <goetz.gaycken@cern.ch>
Date: Tue, 29 Oct 2024 13:20:12 +0100
Subject: [PATCH] Convert to bound state also on empty sensitive surfaces.

This allows to merge retrieval of source link ranges, measurement
selection and track state creation into one unit.

This increases the computational effort slightly for empty, sensitive
surfaces, since the computation of bound states is slightly more
demanding than the computation of curvilinear states, but for complex
events like HL-LHC events the regression was not measurable.

This changes track states on surfaces without measurements, because the
parameterisation for such states changes from curvilinear to bound.
---
 Core/include/Acts/TrackFinding/CombinatorialKalmanFilter.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Core/include/Acts/TrackFinding/CombinatorialKalmanFilter.hpp b/Core/include/Acts/TrackFinding/CombinatorialKalmanFilter.hpp
index 315dd2379b0b..75612f54dc8f 100644
--- a/Core/include/Acts/TrackFinding/CombinatorialKalmanFilter.hpp
+++ b/Core/include/Acts/TrackFinding/CombinatorialKalmanFilter.hpp
@@ -747,7 +747,7 @@ class CombinatorialKalmanFilter {
       }
 
       // Transport the covariance to the surface
-      if (isHole || isMaterialOnly) {
+      if (isMaterialOnly) {
         stepper.transportCovarianceToCurvilinear(state.stepping);
       } else {
         stepper.transportCovarianceToBound(state.stepping, *surface);