conversation: fix updates for last message

Change-Id: I8f1e181a4ce0e9930ada1f35019ca03fbe65b8d0

src/conversationmodel.cpp

@@ -1349,10 +1349,10 @@ ConversationModel::clearInteractionsCache(const QString& convId)
         if (!conversation.isRequest && !conversation.needsSyncing && conversation.isSwarm()) {
             {
                 std::lock_guard<std::mutex> lk(pimpl_->interactionsLocks[convId]);
-                conversation.interactions->clear(1);
+                conversation.interactions->clear();
             }
+            ConfigurationManager::instance().loadConversationMessages(owner.id, convId, "", 1);
             conversation.allMessagesLoaded = false;
-            conversation.lastMessageUid = conversation.interactions->last().first;
         }
     } catch (const std::out_of_range& e) {
         qDebug() << "can't find interaction from conversation: " << e.what();