Try Clazy fix-its

clazy is a compiler plugin which allows clang to understand Qt
semantics. You get more than 50 Qt related compiler warnings, ranging
from unneeded memory allocations to misusage of API, including fix-its
for automatic refactoring.

https://invent.kde.org/sdk/clazy

sources/ElementsCollection/xmlprojectelementcollectionitem.cpp

@@ -206,7 +206,8 @@ void XmlProjectElementCollectionItem::setUpData()
 		ElementsLocation location(embeddedPath(), m_project);
 		DiagramContext context = location.elementInformations();
 		QStringList search_list;
-		for (QString key : context.keys()) {
+		for (const QString& key : context.keys())
+		{
 			search_list.append(context.value(key).toString());
 		}
 		search_list.append(localName());