bug#54656: 29.0.50; [menu] key is not read anymore

[dal-blazej]

It is triggered :

> Thread 1 "emacs" hit Breakpoint 1, handle_one_xevent (dpyinfo=0x55555774f800, 
> event=0x7fffffffd700, finish=0x555555beabb8 <current_finish>, 
> hold_quit=0x7fffffffd970) at xterm.c:5240
> 5240    dpyinfo->last_user_time = time;
> (gdb) s
> 13844       x_display_set_last_user_time (dpyinfo, event->xkey.time);
> (gdb) s
> 0x000055555568a997 in x_display_set_last_user_time (time=119383756, 
> dpyinfo=0x55555774f800) at xterm.c:5240
> 5240    dpyinfo->last_user_time = time;