patch for ticket #15260

Hi folks,

Attached is a patch for the following problem. When the
client is an
observer it didnt handle none of the acceleration keys.

> The 'Reports' menu in GTK2 client is erratic when
observing.
>
> - Pressing the shortcut functions keys
(F1-F3,F5-F9.F11) doesn't have
> any effect.

Thanks.