fix(group): Show correct count of user on first creation

Fix #4503

src/model/group.cpp

@@ -42,6 +42,7 @@ Group::Group(int groupId, const QString& name, bool isAvGroupchat, const QString
     // on naming is appropriate
     hasNewMessages = 0;
     userWasMentioned = 0;
+    regeneratePeerList();
 }
 
 void Group::updatePeer(int peerId, QString name)

src/widget/form/groupchatform.cpp

@@ -121,6 +121,7 @@ GroupChatForm::GroupChatForm(Group* chatGroup)
     connect(group, &Group::titleChanged, this, &GroupChatForm::onTitleChanged);
     connect(&Settings::getInstance(), &Settings::blackListChanged, this, &GroupChatForm::updateUserNames);
 
+    onUserListChanged();
     setAcceptDrops(true);
     Translator::registerHandler(std::bind(&GroupChatForm::retranslateUi, this), this);
 }