Make join and part messages have user links (#3358)

Co-authored-by: pajlada <rasmus.karlsson@pajlada.com>

src/providers/twitch/TwitchMessageBuilder.cpp

@@ -1460,10 +1460,10 @@ void TwitchMessageBuilder::deletionMessage(const DeleteAction &action,
     builder->message().timeoutUser = "msg:" + action.messageId;
 }
 
-void TwitchMessageBuilder::modsOrVipsSystemMessage(QString prefix,
-                                                   QStringList users,
-                                                   TwitchChannel *channel,
-                                                   MessageBuilder *builder)
+void TwitchMessageBuilder::listOfUsersSystemMessage(QString prefix,
+                                                    QStringList users,
+                                                    Channel *channel,
+                                                    MessageBuilder *builder)
 {
     builder->emplace<TimestampElement>();
     builder->message().flags.set(MessageFlag::System);
@@ -1471,6 +1471,7 @@ void TwitchMessageBuilder::modsOrVipsSystemMessage(QString prefix,
     builder->emplace<TextElement>(prefix, MessageElementFlag::Text,
                                   MessageColor::System);
     bool isFirst = true;
+    auto tc = dynamic_cast<TwitchChannel *>(channel);
     for (const QString &username : users)
     {
         if (!isFirst)
@@ -1483,9 +1484,9 @@ void TwitchMessageBuilder::modsOrVipsSystemMessage(QString prefix,
 
         MessageColor color = MessageColor::System;
 
-        if (getSettings()->colorUsernames)
+        if (tc && getSettings()->colorUsernames)
         {
-            if (auto userColor = channel->getUserColor(username);
+            if (auto userColor = tc->getUserColor(username);
                 userColor.isValid())
             {
                 color = MessageColor(userColor);