Michael Henry wrote:
> On Sat, Oct 26, 2013 at 12:50 PM, Bram Moolenaar <[email protected]> wrote:
> > I already said this: It's fine to add so long as it's 100% backwards
> > compatible. That means encoding keys on top of what's already there,
> > and falling back to the ordinary key if the key + modifier isn't mapped.
>
> This is very encouraging to me. I read this as 100%
> compatibility out-of-the-box, which is a fine (and longstanding)
> goal for Vim.
>
> I'd be happy to have a Vim option to control this feature. It
> could default to providing 100% compatible key processing. If
> the user changes this option, he would get clean support for key
> modifiers with some slight backward incompatibilities.
>
> For example, the aliasing of control keys (e.g., CTRL-I being
> equivalent to <Tab>) is a historical artifact that I suspect has
> no value to the vast majority of users. If there were no
> compatibility concern and it's weren't *already* true that
> CTRL-I aliases <Tab>, would anyone seriously argue that we ought
> to *add* that feature to Vim? I suspect not. To me, that's a
> convincing argument to do the simplest possible kind of
> backward compatibility, since very few users actually need the
> old behavior.
>
> So I suggest that a single global option that simply switches on
> support for extended modifier for all keys, regardless whether
> those keys are mapped, may well be good enough and might make
> the implementation simple enough to become reality. The day the
> option appears in Vim, I'll put it at the top of my .vimrc :-)
So we add an option that breaks mappings? No, not a good plan.
It's already implemented that a key-with-modifiers that is not mapped falls
back to the key-without-modifiers. There is no reason to make it more
complicated for the user who hasn't read all the documentation of all
options (hint: nobody has).
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