X-Git-Url: https://git.quassel-irc.org/?a=blobdiff_plain;ds=sidebyside;f=src%2Fclient%2Fmessagemodel.cpp;h=6c93a7f685de76e1622b7982a32a836bab276797;hb=c8ddabf364eff2400c61cea395aefe69eb8ba1b3;hp=1211af9ad4a993f60400525c0a003c1ed317fd45;hpb=41bf70c263ee0af80ad1850fabe77ffffee188f4;p=quassel.git

diff --git a/src/client/messagemodel.cpp b/src/client/messagemodel.cpp
index 1211af9a..6c93a7f6 100644
--- a/src/client/messagemodel.cpp
+++ b/src/client/messagemodel.cpp
@@ -1,5 +1,5 @@
 /***************************************************************************
- *   Copyright (C) 2005-2019 by the Quassel Project                        *
+ *   Copyright (C) 2005-2022 by the Quassel Project                        *
  *   devel@quassel-irc.org                                                 *
  *                                                                         *
  *   This program is free software; you can redistribute it and/or modify  *
@@ -127,7 +127,7 @@ void MessageModel::insertMessageGroup(const QList<Message>& msglist)
     Message dayChangeMsg;
 
     if (start > 0) {
-        // check if the preceeding msg is a daychange message and if so if
+        // check if the preceding msg is a daychange message and if so if
         // we have to drop or relocate it at the end of this chunk
         int prevIdx = start - 1;
         if (messageItemAt(prevIdx)->msgType() == Message::DayChange && messageItemAt(prevIdx)->timestamp() > msglist.at(0).timestamp()) {
@@ -150,7 +150,7 @@ void MessageModel::insertMessageGroup(const QList<Message>& msglist)
         // check if we need to insert a daychange message at the end of the this group
 
         // if this assert triggers then indexForId() would have found a spot right before a DayChangeMsg
-        // this should never happen as daychange messages share the msgId with the preceeding message
+        // this should never happen as daychange messages share the msgId with the preceding message
         Q_ASSERT(messageItemAt(start)->msgType() != Message::DayChange);
         QDateTime nextTs = messageItemAt(start)->timestamp();
         QDateTime prevTs = msglist.last().timestamp();
@@ -188,7 +188,7 @@ int MessageModel::insertMessagesGracefully(const QList<Message>& msglist)
     /* short description:
      * 1) first we check where the message with the highest msgId from msglist would be inserted
      * 2) check that position for dupe
-     * 3) determine the messageId of the preceeding msg
+     * 3) determine the messageId of the preceding msg
      * 4) insert as many msgs from msglist with with msgId larger then the just determined id
      *    those messages are automatically less then the msg of the position we just determined in 1)
      */
@@ -204,7 +204,7 @@ int MessageModel::insertMessagesGracefully(const QList<Message>& msglist)
     QList<Message>::const_iterator iter;
     if (inOrder) {
         iter = msglist.constEnd();
-        --iter;  // this op is safe as we've allready passed an empty check
+        --iter;  // this op is safe as we've already passed an empty check
     }
     else {
         iter = msglist.constBegin();
@@ -393,17 +393,35 @@ void MessageModel::requestBacklog(BufferId bufferId)
     BacklogSettings backlogSettings;
     int requestCount = backlogSettings.dynamicBacklogAmount();
 
+    // Assume there's no available messages
+    MsgId oldestAvailableMsgId{-1};
+
+    // Try to find the oldest (lowest ID) message belonging to this buffer
     for (int i = 0; i < messageCount(); i++) {
         if (messageItemAt(i)->bufferId() == bufferId) {
-            _messagesWaiting[bufferId] = requestCount;
-            Client::backlogManager()->emitMessagesRequested(tr("Requesting %1 messages from backlog for buffer %2:%3")
-                                                                .arg(requestCount)
-                                                                .arg(Client::networkModel()->networkName(bufferId))
-                                                                .arg(Client::networkModel()->bufferName(bufferId)));
-            Client::backlogManager()->requestBacklog(bufferId, -1, messageItemAt(i)->msgId(), requestCount);
-            return;
+            // Match found, use this message ID for requesting more backlog
+            oldestAvailableMsgId = messageItemAt(i)->msgId();
+            break;
         }
     }
+
+    // Prepare to fetch messages
+    _messagesWaiting[bufferId] = requestCount;
+    Client::backlogManager()->emitMessagesRequested(tr("Requesting %1 messages from backlog for buffer %2:%3")
+                                                        .arg(requestCount)
+                                                        .arg(Client::networkModel()->networkName(bufferId))
+                                                        .arg(Client::networkModel()->bufferName(bufferId)));
+
+    if (oldestAvailableMsgId.isValid()) {
+        // Request messages from backlog starting from this message ID, going into the past
+        Client::backlogManager()->requestBacklog(bufferId, -1, oldestAvailableMsgId, requestCount);
+    }
+    else {
+        // No existing messages could be found.  Try to fetch the newest available messages instead.
+        // This may happen when initial backlog fetching is set to zero, or if no messages exist in
+        // a buffer.
+        Client::backlogManager()->requestBacklog(bufferId, -1, -1, requestCount);
+    }
 }
 
 void MessageModel::messagesReceived(BufferId bufferId, int count)