feat(ssh-keygen): -M arg completion

Author: scop

completions/ssh-keygen

@@ -9,7 +9,7 @@ _comp_cmd_ssh_keygen()
     local noargopts='!(-*|*[ aCIJjMNPSVWzbEFRDwfGKsTmnOrtYZ]*)'
     # shellcheck disable=SC2254
     case $prev in
-        -${noargopts}[aCIJjMNPSVWz])
+        -${noargopts}[aCIJjNPSVWz])
             return
             ;;
         -${noargopts}b)
@@ -46,6 +46,10 @@ _comp_cmd_ssh_keygen()
             _comp_compgen_filedir
             return
             ;;
+        -${noargopts}M)
+            _comp_compgen -- -W 'generate screen'
+            return
+            ;;
         -${noargopts}m)
             _comp_compgen -- -W 'PEM PKCS8 RFC4716'
             return