bash completion: ipython <tab> shows only subcmds

If a partial filename, or an flag or option argument is invoked, those
completions will still take place, but by default, to aid the user in
the discovery of subcommands, pressing tab immediately after ipython
will list *only* the subcommands as possible completions

examples/core/ipython-completion.bash

@@ -102,8 +102,8 b' EOF'
         local IFS=$'\t\n'
         COMPREPLY=( $(compgen -W "${__ipython_complete_profiles}" -- ${cur}) )
     else
-        if [ -z "$mode" ]; then
-            COMPREPLY=( $(compgen -f -W "${subcommands}" -- ${cur}) )
+        if [ "$COMP_CWORD" == 1 ]; then
+            COMPREPLY=( $(compgen -W "${subcommands}" -- ${cur}) )
         else
             COMPREPLY=( $(compgen -f -- ${cur}) )
         fi