conversation_module: only ask for invite if needed

GitLab: #1081
Change-Id: I3ac3468e8ff5b41250a76ab7f40b6ca0e7331f09

src/jamidht/conversation_module.cpp

@@ -582,6 +582,10 @@ ConversationModule::Impl::fetchNewCommits(const std::string& peer,
 
     auto conv = getConversation(conversationId);
     if (!conv) {
+        if (oldReq == std::nullopt) {
+            // We didn't find a conversation or a request with the given ID.
+            // This suggests that someone tried to send us an invitation but
+            // that we didn't receive it, so we ask for a new one.
             JAMI_WARNING("[Account {}] Unable to find conversation {}, ask for an invite",
                          accountId_,
                          conversationId);
@@ -589,6 +593,7 @@ ConversationModule::Impl::fetchNewCommits(const std::string& peer,
                        {},
                        std::map<std::string, std::string> {{MIME_TYPE_INVITE, conversationId}},
                        0);
+        }
         return;
     }
     std::unique_lock lk(conv->mtx);