DPL: fix timePipelined enumeration also for t = 0 (#3001)

Author: ktf

Framework/Core/src/LifetimeHelpers.cxx

@@ -52,7 +52,7 @@ ExpirationHandler::Creator LifetimeHelpers::dataDrivenCreation()
 
 ExpirationHandler::Creator LifetimeHelpers::enumDrivenCreation(size_t start, size_t end, size_t step, size_t inputTimeslice, size_t maxInputTimeslices)
 {
-  auto last = std::make_shared<size_t>(start);
+  auto last = std::make_shared<size_t>(start + inputTimeslice * step);
   return [start, end, step, last, inputTimeslice, maxInputTimeslices](TimesliceIndex& index) -> TimesliceSlot {
     for (size_t si = 0; si < index.size(); si++) {
       if (*last > end) {
@@ -61,7 +61,7 @@ ExpirationHandler::Creator LifetimeHelpers::enumDrivenCreation(size_t start, siz
       auto slot = TimesliceSlot{si};
       if (index.isValid(slot) == false) {
         TimesliceId timestamp{*last};
-        *last += step * (maxInputTimeslices + inputTimeslice);
+        *last += step * maxInputTimeslices;
         index.associate(timestamp, slot);
         return slot;
       }