Function DeleteInvalidEngineNews

src/news_gui.cpp:1056–1061

* Remove engine announcements for invalid engines. */

 * Remove engine announcements for invalid engines.
 */
void DeleteInvalidEngineNews()
{
	DeleteNews([](const auto &ni) {
		return IsInvalidEngineNews(ni.ref1) || IsInvalidEngineNews(ni.ref2);
	});
}

static void RemoveOldNewsItems()
{