refs #18950 Forced deadTime data to be read during cache

MantidQt/CustomInterfaces/src/Muon/MuonAnalysisDataLoader.cpp

@@ -73,7 +73,7 @@ LoadResult MuonAnalysisDataLoader::loadFiles(const QStringList &files) const {
     throw std::invalid_argument("Supplied list of files is empty");
 
   // Convert list of files into a mangled map key
-  const auto toString = [](QStringList qsl) {
+    const auto toString = [](QStringList qsl) {
     std::ostringstream oss;
     qsl.sort();
     for (const QString qs : qsl) {
@@ -86,9 +86,27 @@ LoadResult MuonAnalysisDataLoader::loadFiles(const QStringList &files) const {
   updateCache();
   // Check cache to see if we've loaded this set of files before
   const std::string fileString = toString(files);
-  if (m_loadedDataCache.find(fileString) != m_loadedDataCache.end()) {
-    g_log.information("Using cached workspace for file(s): " + fileString);
-    return m_loadedDataCache[fileString];
+  if (m_loadedDataCache.find(fileString) != m_loadedDataCache.end())
+  {
+	  LoadResult result = m_loadedDataCache[fileString];
+	  if (m_deadTimesType == DeadTimesType::FromFile) { // manually reset the DeadTime
+		  IAlgorithm_sptr load =
+			  AlgorithmManager::Instance().createUnmanaged("LoadMuonNexus");
+		  load->initialize();
+		  load->setChild(true);
+		  load->setLogging(false); // We'll take care of printing messages ourselves
+		  std::string fileString2 = toString(files);
+		  fileString2.pop_back();
+		  const std::string fileString3 = fileString2;
+		  load->setPropertyValue("Filename", fileString3);
+		  g_log.information("Using cached workspace for file(s): " + fileString);
+		  // Just to pass validation
+		  load->setPropertyValue("OutputWorkspace", "__NotUsed");
+		  load->setPropertyValue("DeadTimeTable", "__NotUsed");
+		  load->execute();
+		  result.loadedDeadTimes = load->getProperty("DeadTimeTable");
+	  }
+    return result;
   }
 
   LoadResult result;