fix coc autocompletion bug

vim-config/configs.vim

@@ -342,26 +342,11 @@ endif
 autocmd BufNew,BufEnter *.ts execute "silent! CocDisable"
 autocmd BufLeave *.ts execute "silent! CocEnable"
 
-" Use tab for trigger completion with characters ahead and navigate.
+" Use tab for trigger completion with characters ahead.
 " 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
+inoremap <expr> <Tab> coc#pum#visible() ? coc#pum#next(1) : "\<Tab>"
+inoremap <expr> <S-Tab> coc#pum#visible() ? coc#pum#prev(1) : "\<S-Tab>"
 
 " Use <cr> to confirm completion, `<C-g>u` means break undo chain at current
 " position. Coc only does snippet and additional edit on confirm.