fix c++11 range-loop might detach Qt container

src/popups/UserMentions.cpp

@@ -74,7 +74,7 @@ UserMentions::initializeMentions(const QMap<QString, mtx::responses::Notificatio
         nhlog::ui()->debug("Initializing " + std::to_string(notifs.size()) + " notifications.");
 
         for (const auto &item : notifs) {
-                for (const auto notif : item.notifications) {
+                for (const auto &notif : item.notifications) {
                         const auto event_id = QString::fromStdString(utils::event_id(notif.event));
 
                         try {

src/timeline/DelegateChooser.cpp

@@ -91,7 +91,7 @@ DelegateChooser::clearChoices(QQmlListProperty<DelegateChoice> *p)
 void
 DelegateChooser::recalcChild()
 {
-        for (const auto choice : choices_) {
+        for (const auto choice : qAsConst(choices_)) {
                 auto choiceValue = choice->roleValue();
                 if (!roleValue_.isValid() || !choiceValue.isValid() || choiceValue == roleValue_) {
                         if (child) {