When using multiple keyboard layouts, the first layout would always
be used for internal keyboard layout queries.
This meant for e.g. with English layouts QWERTY & DVORAK both active
Control-C always used the QWERTY location for C even when DVORAK was
active.
Resolve by detecting layout changes & run xkb_state_update_mask
on all xkb_state's so internal queries always use the active layout.
Based on !115161, extended to detect layout changes & account for all
internal states.
Co-authored-by: Eugene Kuznetsov <eugene.kuznetsov@amd.com>
258a083066