KeyRelease event, serial 38, synthetic NO, window 0x3000001,
    root 0xc9, subw 0x0, time 5495828, (355,791), root:(356,842),
    state 0x0, keycode 172 (keysym 0x1008ff14, XF86AudioPlay), same_screen YES,
    XLookupString gives 0 bytes:
    XFilterEvent returns: False