Information on xkb group index in bits 13 & 14 of event state information for input events

[Po Lu]

Farblos <akfkqu.9df7rp at vodafonemail.de> writes:

> Hi Xorg,
>
> in this FVWM issue:
>
>   https://github.com/fvwmorg/fvwm3/issues/861
>
> bits 13 and 14 encoding the XKB group index in event->xkey.state
> on behalf of the XKB extension interfere with FVWM's modifier
> handling.
>
> At least that is what I have understood so far from my tests and
>
>   https://www.x.org/releases/X11R7.6/doc/libX11/specs/XKB/xkblib.html#xkb_state_to_core_protocol_state_transformation
>
> Is there anything better than just masking out bits 13 and 14 in
> event->xkey.state as I have proposed as solution for that issue?
> Is there some constant that represents these two bits?

No, the solution is to remove those two bits.  This has no negative
consequences, but make sure the bits are restored before the event's
modifier mask is provided to a keycode or keysym translation function.