feat(ssh-keygen): -Z argument completion

Co-authored-by: Koichi Murase <myoga.murase@gmail.com>

Author: scop

completions/ssh-keygen

@@ -6,7 +6,7 @@ _comp_cmd_ssh_keygen()
     _comp_initialize -n := -- "$@" || return
 
     local IFS=$' \t\n' # for ${words[*]}
-    local noargopts='!(-*|*[ aCIJjMNPSVWzbEFRDwfGKsTmnOrtY]*)'
+    local noargopts='!(-*|*[ aCIJjMNPSVWzbEFRDwfGKsTmnOrtYZ]*)'
     # shellcheck disable=SC2254
     case $prev in
         -${noargopts}[aCIJjMNPSVWz])
@@ -152,6 +152,10 @@ _comp_cmd_ssh_keygen()
             _comp_compgen -- -W 'find-principals check-novalidate sign verify'
             return
             ;;
+        -${noargopts}Z)
+            _comp_compgen -x ssh query ciphers
+            return
+            ;;
     esac
 
     _comp_compgen_set