Log Message:
Import xxkb version 1.11 from pkgsrc-wip.
Packaged by Aleksey Cheusov and requested to import in PR 35665.

XXKB remembers the layout for each application window and changes the
keyboard state accordingly when the window gets a focus, it also shows
the current keyboard layout (an XKB group) and allows to switch it
with a mouse click and has many other useful features.