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ITSMFT: fix MC labels for single pixel clusters in the labels #16098

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ITSMFT: fix MC labels for single pixel clusters in the labels #16098

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5 changes: 4 additions & 1 deletion Detectors/ITSMFT/common/reconstruction/src/Clusterer.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -315,7 +315,10 @@ void Clusterer::ClustererThread::finishChipSingleHitFast(uint32_t hit, ChipPixel

if (labelsClusPtr) { // MC labels were requested
int nlab = 0;
fetchMCLabels(curChipData->getStartID() + hit, labelsDigPtr, nlab);
// Squashing can remove earlier digits on the chip, so the surviving
// pixel's source index need not be contiguous with the chip's start.
const auto digitID = parent->mSquashingDepth ? curChipData->getOrderedPixId(hit) : curChipData->getStartID() + hit;
fetchMCLabels(digitID, labelsDigPtr, nlab);
auto cnt = compClusPtr->size();
for (int i = 0; i < nlab; i++) {
labelsClusPtr->addElement(cnt, labelsBuff[i]);
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