update coc settings, fix quick-fix

Author: gergap

.vimrc

@@ -667,9 +667,9 @@ else
   inoremap <silent><expr> <c-@> coc#refresh()
 endif
 
-" Make <CR> auto-select the first completion item and notify coc.nvim to
-" format on enter, <cr> could be remapped by other vim plugin
-inoremap <silent><expr> <cr> pumvisible() ? coc#_select_confirm()
+" Make <CR> to accept selected completion item or notify coc.nvim to format
+" <C-g>u breaks current undo, please make your own choice.
+inoremap <silent><expr> <CR> coc#pum#visible() ? coc#pum#confirm()
                               \: "\<C-g>u\<CR>\<c-r>=coc#on_enter()\<CR>"
 
 " Use `[g` and `]g` to navigate diagnostics
@@ -942,8 +942,7 @@ map <leader><F7> :call CleanBuild()<CR>
 " Simple hexify/unhexify
 noremap <F8> :call <sid>Hexify()<CR>
 " Apply CoC FixIt
-map <F9> <Plug>(coc-fix-current)
-"map <F9> :make run<CR>
+nmap <F9> <Plug>(coc-fix-current)
 " remove trailing spaces
 map <F10> :%s/\s\+$//<CR>
 " goto definition with F12
@@ -1107,76 +1106,6 @@ nmap <silent> <expr>  zu  FS_FoldAroundTarget('^\s*use\s\+\S.*;',{'context':1})
 au BufRead /var/tmp/mutt-* source ~/.mutt/mutt-aliases.vim
 let g:mutt_aliases_file="~/.mutt/aliases.generated"
 
-"==============[ CoC Config ]======================
-
-" Don't pass messages to |ins-completion-menu|.
-set shortmess+=c
-
-" Always show the signcolumn, otherwise it would shift the text each time
-" diagnostics appear/become resolved.
-if has("nvim-0.5.0") || has("patch-8.1.1564")
-  " Recently vim can merge signcolumn and number column into one
-  set signcolumn=number
-else
-  set signcolumn=yes
-endif
-
-" Use tab for trigger completion with characters ahead and navigate.
-" NOTE: Use command ':verbose imap <tab>' to make sure tab is not mapped by
-" other plugin before putting this into your config.
-inoremap <silent><expr> <TAB>
-      \ pumvisible() ? "\<C-n>" :
-      \ <SID>check_back_space() ? "\<TAB>" :
-      \ coc#refresh()
-inoremap <expr><S-TAB> pumvisible() ? "\<C-p>" : "\<C-h>"
-
-function! s:check_back_space() abort
-  let col = col('.') - 1
-  return !col || getline('.')[col - 1]  =~# '\s'
-endfunction
-
-" Use <c-space> to trigger completion.
-if has('nvim')
-  inoremap <silent><expr> <c-space> coc#refresh()
-else
-  inoremap <silent><expr> <c-@> coc#refresh()
-endif
-
-" Make <CR> auto-select the first completion item and notify coc.nvim to
-" format on enter, <cr> could be remapped by other vim plugin
-inoremap <silent><expr> <cr> pumvisible() ? coc#_select_confirm()
-                              \: "\<C-g>u\<CR>\<c-r>=coc#on_enter()\<CR>"
-
-" Use `[g` and `]g` to navigate diagnostics
-" Use `:CocDiagnostics` to get all diagnostics of current buffer in location list.
-"nmap <silent> [g <Plug>(coc-diagnostic-prev)
-"nmap <silent> ]g <Plug>(coc-diagnostic-next)
-
-" GoTo code navigation.
-nmap <silent> gd <Plug>(coc-definition)
-nmap <silent> gy <Plug>(coc-type-definition)
-nmap <silent> gi <Plug>(coc-implementation)
-nmap <silent> gr <Plug>(coc-references)
-
-" Use K to show documentation in preview window.
-nnoremap <silent> <leader>K :call <SID>show_documentation()<CR>
-
-function! s:show_documentation()
-  if (index(['vim','help'], &filetype) >= 0)
-    execute 'h '.expand('<cword>')
-  elseif (coc#rpc#ready())
-    call CocActionAsync('doHover')
-  else
-    execute '!' . &keywordprg . " " . expand('<cword>')
-  endif
-endfunction
-
-" Highlight the symbol and its references when holding the cursor.
-autocmd CursorHold * silent call CocActionAsync('highlight')
-
-" Symbol renaming.
-nmap <leader>rn <Plug>(coc-rename)
-
 "=====[ Vimspector ]=====================
 "nmap <F5> <Plug>VimspectorContinue
 "nmap <S-F5> <Plug>VimspectorReset