refs #852 CAirspaceMonitor has no maximum number of parts per callsign,

but regularly prune the list based on timestamp age.

src/blackcore/airspacemonitor.cpp

@@ -1238,7 +1238,12 @@ namespace BlackCore
         // list sorted from new to old
         QWriteLocker lock(&m_lockParts);
         CAircraftPartsList &partsList = this->m_partsByCallsign[callsign];
-        partsList.push_frontMaxElements(parts, MaxPartsPerCallsign);
+        partsList.push_front(parts);
+
+        // remove outdated parts (but never remove the most recent one)
+        const auto predicate = [now = parts.getMSecsSinceEpoch()](const auto & p) { return p.getMSecsSinceEpoch() >= now - PartsPerCallsignMaxAgeInSeconds * 1000; };
+        const auto newEnd = std::find_if(partsList.rbegin(), partsList.rend(), predicate).base();
+        partsList.erase(newEnd, partsList.end());
 
         partsList.front().setTimeOffsetMs(timeOffsetMs);