Christian Brabandt wrote:
> On Fr, 12 Dez 2014, Ingo Karkat wrote:
>
> > Hello Vim developers,
> >
> > patch 7.4.468 (BTW it doesn't appear in the list on
> > ftp://ftp.vim.org/vol/2/vim/patches/7.4/README) addressed
> >
> > > Issue 26: CTRL-C does not interrupt after it was mapped and then
> > > unmapped
> >
> > However, it apparently fails to consider the mapping _modes_ of
> > CTRL-C, so when I have such insert mode mapping, then do :cmap <C-c>
> > ... | cunmap <C-c>, the insert mode mapping (though it still is listed
> > by :imap) becomes ineffective! (Same for other mode combinations.) I
> > have various mappings that include the <C-c> key (have I mentioned I'm
> > running out of keys?), and all of these get broken because one of my
> > plugins temporarily sets up a :cmap <C-c>.
> >
> >
> > I've used the following scriptlet to bisect the problem:
> >
> > nnoremap <C-c> :quit!<CR>
> > nnoremap <C-x> :cquit!<CR>
> > cnoremap <C-c> dummy
> > cunmap <C-c>
> > echomsg "Press <C-c><C-x> now"
> >
> > Interestingly, it requires actual typed keys, even :call
> > feedkeys("\<C-c>", 't') doesn't work.
> >
> > I can reproduce this both on Windows/x64 and Linux/x64, up to the
> > current Vim 7.4.542.
> >
> > Christian (as the author of the original patch), I hope you'll be able
> > to get a fix for that!
>
> The fix is easy. Simply increment the mapped_ctrl_c flag when mapping
> CTRL-C and decrement it when unmapping. Then Ctrl-C will work as
> interrupt only, when ctrl-c is never mapped.
Looks like this patch does not handle the sequence:
:map <C-C> a
:map <C-C> b
:unmap <C-C>
I would suggest getting the state flags for the mapping and using "OR"
when mapping and "AND with inverted" when unmapping. Then when the
result is zero we know CTRL-C is not mapped.
As mentioned further on in the thread, ideally we would use the mask
also for handling CTRL-C differently depending on the current mode.
Not sure how easy or difficult that would be.
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