feat: relay on languagetree commentstring as much as possible

lua/ts_context_commentstring/internal.lua

@@ -70,8 +70,9 @@ function M.calculate_commentstring(args)
 
   local language = language_tree:lang()
   local language_config = config.get_languages_config()[language]
+  local filetypes = vim.treesitter.language.get_filetypes(language)
 
-  return M.check_node(node, language_config, key)
+  return M.check_node(node, language_config, key, filetypes)
 end
 
 ---Update the `commentstring` setting based on the current location of the
@@ -104,9 +105,19 @@ end
 ---@param commentstring_key string
 ---
 ---@return string | nil
-function M.check_node(node, language_config, commentstring_key)
+function M.check_node(node, language_config, commentstring_key, filetypes)
   commentstring_key = commentstring_key or '__default'
 
+  -- relay on languagetree for commentstring as much as possible
+  if filetypes then
+    for _, ft in ipairs(filetypes) do
+      local cs = vim.filetype.get_option(ft, 'commentstring')
+      if type(cs) == 'string' and cs ~= '' then
+        return cs
+      end
+    end
+  end
+
   -- There is no commentstring configuration for this language, use the
   -- `ts_original_commentstring`
   if not language_config then