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/ui/lineeditor.cpp

@@ -223,7 +223,8 @@ void LineEditor::setUpChangeConnections()
  */
 void LineEditor::disconnectChangeConnections()
 {
-	for (auto connection : m_change_connections) {
+	for (const auto& connection : std::as_const(m_change_connections))
+	{
 		disconnect(connection);
 	}