[vim] flutter and dart config

vim/ftplugin/dart.vim

@@ -0,0 +1,7 @@
+set tabstop=2
+set shiftwidth=2
+set expandtab
+set smartindent
+
+xmap <leader>a  <Plug>(coc-codeaction-selected)
+nmap <leader>a  <Plug>(coc-codeaction-selected)

vim/vimrc

@@ -155,9 +155,9 @@ let g:ansible_yamlKeyName = 'yamlKey'
 "
 " CoC plugin settings
 "
-let g:coc_global_extensions = ['coc-pyright']
+let g:coc_global_extensions = ['coc-pyright', 'coc-flutter']
 function! s:enable_coc_for_type()
-        let l:filesuffix_whitelist = ['py']
+        let l:filesuffix_whitelist = ['py', 'dart']
         if index(l:filesuffix_whitelist, expand('%:e')) == -1
           let b:coc_enabled = 0
         endif