vim: fix the stupid Ctrl-I

https://vi.stackexchange.com/questions/39717/mapping-to-ctrlm-and-ctrli-in-neovim

Also nmap K into jumping to definition. Use Ctrl-O/I to jump around the jumplist.

vimrc

@@ -192,9 +192,7 @@ autocmd FileType c,cpp,go,rust,typescript   inoremap <buffer> <C-]> {}<Left>
 autocmd FileType vim,tex,python  inoremap <buffer> { {}<Left>
 autocmd FileType vim,tex,python  inoremap <buffer> <C-]> <End>{<CR>}<Up><End><CR>
 
-autocmd Filetype go,rust,python,typescript map <buffer><silent><expr> K CocAction("jumpDefinition")
+autocmd Filetype c,cpp,go,rust,python,typescript nmap <buffer><silent> K <Plug>(coc-definition)
-autocmd FileType c,cpp map <buffer><silent><expr> K CocAction("jumpDeclaration")
-autocmd FileType c,cpp map <buffer><silent><expr> <C-K> CocAction("jumpDefinition")
 augroup END
 
 
@@ -216,9 +214,18 @@ else
   inoremap <silent><expr> <c-@> coc#refresh()
 endif
 
+" Guess what? Despite Neovim being smart enough to distinguish
+" <Ctrl-I> from <Tab>, it treats <Ctrl-I> as <Tab> anyways if
+" you have a normal mode mapping for <Tab>. Screw me I guess.
+"
+" https://vi.stackexchange.com/a/46704
+" https://github.com/neovim/neovim/pull/17932
+"
+" This magical line tricks Nvim into being smart again.
+nnoremap <C-I> <C-I>
+
 " Press Meta-I to invoke hover
 nmap <silent> <Tab> :call CocAction('doHover')<CR>
-"nmap <silent><expr> <C-I> CocAction('doHover')
 
 " Use tab for trigger completion / cycle snippet replaces.
 inoremap <silent><expr> <TAB>