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/editor/graphicspart/customelementgraphicpart.cpp

@@ -530,7 +530,7 @@ void CustomElementGraphicPart::stylesFromXml(const QDomElement &qde)
 
 		//Check each pair of style
 	QRegularExpression rx("^\\s*([a-z-]+)\\s*:\\s*([a-zA-Z-]+)\\s*$");
-	for (auto style : styles)
+	for (const auto& style : std::as_const(styles))
 	{
 		auto rx_match = rx.match(style);
 		if (!rx_match.hasMatch()) {