1

There is the supertab binding <c-tab> that is supposed to produce a normal tab, but that doesn't work on my system (Mac; tried in iTerm and terminal). And I just remembered reading that Tab is equivalent to <c-i>. Wouldn't that imply that <c-tab><c-c-i> (≡ nonsense)? (I don't really need this binding, <c-v><c-i> is fine; but it got me curious.)

3

You are right about tab being the same same as ctrl+i, as explained in :help key-codes:

                    *key-notation* *key-codes* *keycodes*
These names for keys are used in the documentation.  They can also be used
with the ":map" command (insert the key name by pressing CTRL-K and then the
key you want the name for).

notation    meaning         equivalent  decimal value(s)    ~
-----------------------------------------------------------------------
<Nul>       zero            CTRL-@    0 (stored as 10) *<Nul>*
<BS>        backspace       CTRL-H    8 *backspace*
<Tab>       tab         CTRL-I    9 *tab* *Tab*

Following the procedure on Vim FAQ "20.4. I am not able to create a mapping for the key. What is wrong?" on my machine the output for ctrl+v tab differs from ctrl+v ctrl+tab, both on terminal and gVim,

So Vim is able to map ctrl+tab and tab independently. You could use the following mappings to check if your problem caused by some problem in Vim recognizing ctrl+tab or in supertab plugin:

inoremap <c-tab> abc
inoremap <tab> def
  • From your answer I conclude that nothing can be done on my system. in iterm, c-tab produces nothing; in terminal, remapping tab also affects c-tab. – Toothrot Mar 26 '16 at 12:36

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