prevent duplicates when adding dm to the list of decrypted messages (in memory) - untested

src/twister.cpp

@@ -1010,7 +1010,19 @@ Value newdirectmsg(const Array& params, bool fHelp)
     stoDM.m_utcTime = v["userpost"]["time"].integer();
     {
         LOCK(cs_twister);
-        m_users[strFrom].m_directmsg[strTo].push_back(stoDM);
+
+        std::list<StoredDirectMsg> &dmsFromToUser = m_users[strFrom].m_directmsg[strTo];
+        std::list<StoredDirectMsg>::const_iterator it;
+        // prevent duplicates
+        for( it = dmsFromToUser.begin(); it != dmsFromToUser.end(); ++it ) {
+            if( stoDM.m_utcTime == (*it).m_utcTime &&
+                stoDM.m_text    == (*it).m_text ) {
+                break;
+            }
+        }
+        if( it != dmsFromToUser.end() ) {
+            dmsFromToUser.push_back(stoDM);
+        }
     }
 
     return entryToJson(v);

src/twister_utils.cpp

@@ -150,10 +150,8 @@ int saveUserData(std::string const& filename, std::map<std::string,UserData> con
 
             std::map<std::string, std::list<StoredDirectMsg> >::const_iterator j;
             for (j = udata.m_directmsg.begin(); j != udata.m_directmsg.end(); ++j) {
-                std::list<StoredDirectMsg> const &dmsToFromUser = j->second;
-
                 entry &dmList = dmDict[j->first];
-                BOOST_FOREACH( StoredDirectMsg const &stoDm, dmsToFromUser) {
+                BOOST_FOREACH( StoredDirectMsg const &stoDm, j->second) {
                     entry dmElem;
                     dmElem["time"]   = stoDm.m_utcTime;
                     dmElem["text"]   = stoDm.m_text;