Prevent timeline being black on some platforms

src/main.cpp

@@ -116,6 +116,7 @@ main(int argc, char *argv[])
         QCoreApplication::setApplicationName("nheko");
         QCoreApplication::setApplicationVersion(nheko::version);
         QCoreApplication::setOrganizationName("nheko");
+        QCoreApplication::setAttribute(Qt::AA_DontCreateNativeWidgetSiblings);
         QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
         QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
         SingleApplication app(argc,