This is a know upstream limitation/bug, annonying as hell. Even documented in /usr/share/doc/xfce4-xkb-plugin/README. To work around this, (/usr/share/doc/xfce4-xkb-plugin/README), set "never_modify_config" to "true" in ~/.config/xfce4/panel/xkb-plugin-??.rc and use /etc/default/keyboard to configure multiple layouts. The relevant part I am using there:
XKBMODEL="pc105" XKBLAYOUT="us,cz" XKBVARIANT="altgr-intl,qwerty" XKBOPTIONS="grp:alt_shift_toggle,compose:menu,terminate:ctrl_alt_bksp,grp_led:scroll" -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org