Migration code will be removed in qt6 + AA_UseHighDpiPixmaps is enabled by default in qt6

src/main.cpp

@@ -41,7 +41,9 @@ int main(int argc, char **argv)
 {
 	qsrand(std::time(nullptr));
 	// Fixes blurry icons with fractional scaling
-    QGuiApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
+    QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
+#endif
     QApplication app(argc, argv);
 	KLocalizedString::setApplicationDomain("ksudoku");