Referenced by event_add_idle(), event_android_add_idle(), event_call_callback(), event_cocoa_add_idle(), event_glib_add_idle(), event_glib_call_idle(), event_qt5_add_idle(), event_sdl_add_idle(), event_win32_add_idle(), event_win32_call_callback(), and graphics_sdl_new().
Referenced by event_glib_add_idle(), and event_glib_remove_idle().