Invoke ping callback only if a new ping value has been added.

src/net/clientthread.h

@@ -77,14 +77,17 @@ public:
 	void StartPing() {
 		pingTimer.start();
 	}
-	void EndPing() {
+	bool EndPing() {
+		bool retVal = false;
 		if (pingTimer.is_running()) {
 			pingValues.push_back((unsigned)pingTimer.elapsed().total_milliseconds());
 			if (pingValues.size() > SIZE_PING_BACKLOG) {
 				pingValues.pop_front();
 			}
 			pingTimer.reset();
+			retVal = true;
 		}
+		return retVal;
 	}
 
 private:

src/net/common/clientthread.cpp

@@ -1566,8 +1566,9 @@ void
 ClientThread::EndPing()
 {
 	boost::mutex::scoped_lock lock(m_pingDataMutex);
-	m_pingData.EndPing();
-	GetCallback().SignalNetClientPingUpdate(m_pingData.MinPing(), m_pingData.AveragePing(), m_pingData.MaxPing());
+	if (m_pingData.EndPing()) {
+		GetCallback().SignalNetClientPingUpdate(m_pingData.MinPing(), m_pingData.AveragePing(), m_pingData.MaxPing());
+	}
 }
 
 ServerStats