Ingo Karkat wrote:

> On 06-Oct-2014 12:41 +0200, Paul \"leonerd\" Evans wrote:
> 
> > On Sat, 4 Oct 2014 12:37:45 -0700
> > "/#!/JoePea" <[email protected]> wrote:
> > 
> >> Hmmm, yep. I just tested. gvim and MacVim both don't differentiate
> >> tab and ctrl_i!
> >>
> >> */#!/*JoePea
> >>
> >> On Sat, Oct 4, 2014 at 12:34 PM, Ingo Karkat <[email protected]>
> >> wrote:
> >>
> >>> On 04-Oct-2014 15:43 +0200, Bram Moolenaar wrote:
> >>>
> >>>> Not sure what your problem is.  This works just fine:
> >>>>
> >>>> imap <C-I> <Up>
> >>>>
> >>>> It does require gvim, since a terminal doesn't make a difference
> >>>> between Tab and CTRL-I.
> > 
> > This, Bram, is exactly the thing I have been arguing at you for years
> > now. You keep deflecting this down to make it sound like the terminal's
> > fault, when we both know it isn't.
> > 
> > You and I both know full well that terminals don't distinguish them; I
> > accept that. That's why I designed a better system, in cooperation with
> > Thomas Dickey (the current xterm author). I have a terminal now that
> > distinguishes any and all possible combinations of keypresses, and
> > programs that understand it. Most of the programs I run regularly now
> > do understand this - I can type Ctrl-I and Ctrl-Shift-A and so on
> > absolutely fine. Vim is one of the few programs remaining that doesn't.
> > (see attached screenshot-1).
> > 
> > Vim - I am talking specifically about vim here - conflates the possible
> > keypresses of Ctrl-I vs Tab, of Ctrl-M(or is it Ctrl-J I forget) and
> > Enter, of Ctrl-H and Backspace. It further conflates Ctrl-S and
> > Ctrl-Shift-S, etc etc... And lets not get started on Unicode vs.
> > Alt-letters.
> > 
> > Blaming terminals for this is just deflecting from the fact that vim's
> > internals aren't sufficiently generic to represent the possible
> > keypresses, regardless of how they arrive. That 1980s-style terminals
> > couldn't do it is one thing but that is no excuse that a 2014-style
> > GTK/Win32-driven GUI program cannot.
> > 
> > You cannot reply to the original poster of this email and claim that it
> > works, until you can perform the following test IN GVIM to demonstrate
> > it so.
> > 
> >   :imap <Tab> You typed tab
> >   :imap <C-i> You typed Ctrl-I
> >   :imap <C-S-I> You typed Ctrl-Shift-I
> > 
> > Then press all three keypresses and show it inserting different text.
> > Do this in gvim, so as to avoid any reason to blame the terminal. For
> > me, right now in GTK2-driven gvim, I get the Ctrl-Shift-I version all
> > three times. (see attached screenshot-2)
> > 
> > Only when that works can you reply to the OP and say "this works".
> 
> To provide evidence that this issue indeed troubles many people
> (especially newcomers to Vim), here's an updated tally of related
> questions that regularly come up on Stack Overflow and related sites:
> 
> https://www.google.com/search?q=site%3Astackoverflow.com%20%2B%22Ingo%20Karkat%22%20%22foremost%20Paul%20LeoNerd%20Evans%22
> (about 32 results)
> 
> https://www.google.com/search?q=site%3Asuperuser.com+%2B%22Ingo+Karkat%22+%22foremost+Paul+LeoNerd+Evans%22
> (6 results)
> 
> I'm happy to see that Paul is still pursuing this issue; Bram, why don't
> you get him and other developers finally started on designing and
> implementing a solution by briefly signaling a willingness to consider
> this for a future Vim 8.0?!

This has nothing to do with willingness.  The solution provided will
cause more trouble than it solves, and is very limited otherwise.  In
other words: it is not a good solution.

We could do something for the GUI, I thought there was a todo item for
that already.  Can't find it now...  The idea basically is that when Tab
and CTRL-I are both mapped, they will be considered to be different.
This is required for existing mappings to keep working.  It will still
break when someone tries to overrule a mapping for Tab with a mapping
for CTRL-I though.  Hopefully that doesn't happen very often.

-- 
hundred-and-one symptoms of being an internet addict:
227. You sleep next to your monitor.  Or on top of it.

 /// Bram Moolenaar -- [email protected] -- http://www.Moolenaar.net   \\\
///        sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ \\\
\\\  an exciting new programming language -- http://www.Zimbu.org        ///
 \\\            help me help AIDS victims -- http://ICCF-Holland.org    ///

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