fix: Potential Out of Bounds in Root file reading (#3870)

Fix possible Out of Bounds access on data filled by ROOT
The data output by `->Draw` is guaranteed to be properly initialized
and filled

Examples/Io/Root/src/RootMaterialTrackReader.cpp

@@ -89,6 +89,10 @@ RootMaterialTrackReader::RootMaterialTrackReader(const Config& config,
 
   // Sort the entry numbers of the events
   {
+    // necessary to guarantee that m_inputChain->GetV1() is valid for the
+    // entire range
+    m_inputChain->SetEstimate(nentries);
+
     m_entryNumbers.resize(nentries);
     m_inputChain->Draw("event_id", "", "goff");
     RootUtility::stableSort(m_inputChain->GetEntries(), m_inputChain->GetV1(),