Index: sources/utility/format.cpp
===================================================================
diff -u -r79a6cfcb10472261f3ec26eaf0baf6f1245cd311 -ra5c75192af33a9284e4b4886df0c337ba6fcc9f9
--- sources/utility/format.cpp	(.../format.cpp)	(revision 79a6cfcb10472261f3ec26eaf0baf6f1245cd311)
+++ sources/utility/format.cpp	(.../format.cpp)	(revision a5c75192af33a9284e4b4886df0c337ba6fcc9f9)
@@ -94,7 +94,7 @@
     case QMetaType::QVariantList:       // list
     {
         QVariantList list = vData.toList();
-        for(auto item: list) {
+        for(const auto &item: qAsConst(list)) {
             mData += fromVariant(item);
         }
         return mData;