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

src/main.cpp

@@ -20,7 +20,9 @@
 int main(int argc, char *argv[])
 {
     // Fixes blurry icons with fractional scaling
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
     QGuiApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
+#endif
     QApplication app(argc, argv);
 
     Kdelibs4ConfigMigrator migrate(QStringLiteral("kbreakout"));