In _setxkbmap_variant, the script looks for the pattern *xkb_symbols*\"([[:alnum:]])

This prevent variants containing non alphanumeric symbols to be included in the completion. For example,
$ setxkbmap us <Tab>
fails to suggest altgr-intl, classmate-intl, cz_sk_de, dvorak-classic, dvorak-r, intl-unicode, workman-intl, alt-intl, classmate-altgr-intl, dvorak-intl, sun_type6, alt-intl-
unicode, classmate-alt-intl, dvorak-alt-intl  and dvorak-l variants                                                                                                           

This patch fixes this issue by looking for pattern *xkb_symbols*\"([^\"])

It also replaces # compdef setxkbmap by #compdef setxkbmap. The spurious space prevented the completion to be loaded in the first place.