Output a log, savegame and screenshot on desync events

src/network/network_client.cpp

@@ -31,6 +31,7 @@
 #include "network_client.h"
 #include "../core/backup_type.hpp"
 #include "../thread.h"
+#include "../crashlog.h"
 
 #include "table/strings.h"
 
@@ -282,6 +283,8 @@ void ClientNetworkGameSocketHandler::ClientError(NetworkRecvStatus res)
 				DEBUG(net, 0, "Sync error detected!");
 				my_client->ClientError(NETWORK_RECV_STATUS_DESYNC);
 
+				CrashLog::DesyncCrashLog();
+
 				extern void CheckCaches(bool force_check);
 				CheckCaches(true);
 				return false;

src/network/network_server.cpp

@@ -30,6 +30,7 @@
 #include "../core/pool_func.hpp"
 #include "../core/random_func.hpp"
 #include "../rev.h"
+#include "../crashlog.h"
 #include <mutex>
 #include <condition_variable>
 #if defined(__MINGW32__)
@@ -1170,6 +1171,8 @@ NetworkRecvStatus ServerNetworkGameSocketHandler::Receive_CLIENT_ERROR(Packet *p
 	NetworkAdminClientError(this->client_id, errorno);
 
 	if (errorno == NETWORK_ERROR_DESYNC) {
+		CrashLog::DesyncCrashLog();
+
 		// have the server and all clients run some sanity checks
 		NetworkSendCommand(0, 0, 0, CMD_DESYNC_CHECK, nullptr, nullptr, _local_company, 0);
 	}