Mantain the nextROF bit information (#12348)

* Mantain the information on the nextROF bit

* Do not use the user field

* Fix setting the ROF bit

Author: mpuccio

DataFormats/Detectors/ITSMFT/ITS/include/DataFormatsITS/TrackITS.h

@@ -35,7 +35,8 @@ namespace its
 class TrackITS : public o2::track::TrackParCov
 {
   enum UserBits {
-    kNextROF = 1
+    kNextROF = 1 << 28,
+    kSharedClusters = 1 << 29
   };
 
   using Cluster = o2::itsmft::Cluster;
@@ -120,8 +121,10 @@ class TrackITS : public o2::track::TrackParCov
   }
   int getNFakeClusters();
 
-  void setNextROFbit(bool toggle = true) { setUserField((getUserField() & ~kNextROF) | (-toggle & kNextROF)); }
-  bool hasHitInNextROF() const { return getUserField() & kNextROF; }
+  void setNextROFbit(bool toggle = true) { mClusterSizes = toggle ? (mClusterSizes | kNextROF) : (mClusterSizes & ~kNextROF); }
+  bool hasHitInNextROF() const { return mClusterSizes & kNextROF; }
+  void setSharedClusters(bool toggle = true) { mClusterSizes = toggle ? (mClusterSizes | kSharedClusters) : (mClusterSizes & ~kSharedClusters); }
+  bool hasSharedClusters() const { return mClusterSizes & kSharedClusters; }
 
   void setClusterSize(int l, int size)
   {
@@ -137,7 +140,7 @@ class TrackITS : public o2::track::TrackParCov
 
   int getClusterSize(int l)
   {
-    if (l >= 8) {
+    if (l >= 7) {
       return 0;
     }
     return (mClusterSizes >> (l * 4)) & 0xf;

Detectors/ITSMFT/ITS/tracking/src/TrackerTraits.cxx

@@ -641,6 +641,8 @@ void TrackerTraits::findRoads(const int iteration)
       if (rofs[2] != INT_MAX) {
         continue;
       }
+      track.setUserField(0);
+      track.getParamOut().setUserField(0);
       if (rofs[1] != INT_MAX) {
         track.setNextROFbit();
       }

Detectors/ITSMFT/ITS/workflow/src/TrackerSpec.cxx

@@ -299,8 +299,6 @@ void TrackerDPL::run(ProcessingContext& pc)
       // Some conversions that needs to be moved in the tracker internals
       for (unsigned int iTrk{0}; iTrk < tracks.size(); ++iTrk) {
         auto& trc{tracks[iTrk]};
-        trc.setUserField(0);
-        trc.getParamOut().setUserField(0);
         trc.setFirstClusterEntry(allClusIdx.size()); // before adding tracks, create final cluster indices
         int ncl = trc.getNumberOfClusters(), nclf = 0;
         for (int ic = TrackITSExt::MaxClusters; ic--;) { // track internally keeps in->out cluster indices, but we want to store the references as out->in!!!