updated coc settings

init.vim

@@ -553,14 +553,19 @@ let g:coc_global_extensions = [
 	\ 'coc-yaml',
 	\ 'coc-yank']
 inoremap <silent><expr> <TAB>
-	\ pumvisible() ? "\<C-n>" :
-	\ <SID>check_back_space() ? "\<TAB>" :
-	\ coc#refresh()
-inoremap <expr><S-TAB> pumvisible() ? "\<C-p>" : "\<C-h>"
-inoremap <expr> <cr> complete_info()["selected"] != "-1" ? "\<C-y>" : "\<C-g>u\<CR>"
-function! s:check_back_space() abort
-	let col = col('.') - 1
-	return !col || getline('.')[col - 1]  =~# '\s'
+      \ coc#pum#visible() ? coc#pum#next(1) :
+      \ CheckBackspace() ? "\<Tab>" :
+      \ coc#refresh()
+inoremap <expr><S-TAB> coc#pum#visible() ? coc#pum#prev(1) : "\<C-h>"
+
+" 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>"
+
+function! CheckBackspace() abort
+  let col = col('.') - 1
+  return !col || getline('.')[col - 1]  =~# '\s'
 endfunction
 inoremap <silent><expr> <c-space> coc#refresh()
 inoremap <silent><expr> <c-o> coc#refresh()