How to enter a tab character in vim with SuperTab plugin enabled?
If you want to simulate pressing
<tab> as if SuperTab were not installed (i.e. you want to insert a tab that respects your
:set expandtab settings) then press Ctrl-Tab.
^V-<tab> inserts a literal tab. If you have
:set expandtab enabled then this might not be what you want, because it inserts a real Tab character, not a series of spaces.