reverted syntax highlighting location (after file read)

lua/fzf-lua/previewer/builtin.lua

@@ -285,16 +285,6 @@ function Previewer.buffer_or_file:populate_preview_buf(entry_str)
       self:preview_buf_post(entry)
       return
     end
-    -- enable syntax highlighting
-    if self.syntax then
-      if self.syntax_delay > 0 then
-        vim.defer_fn(function()
-          self:do_syntax(entry)
-        end, self.syntax_delay)
-      else
-        self:do_syntax(entry)
-      end
-    end
     -- read the file into the buffer
     utils.read_file_async(entry.path, vim.schedule_wrap(function(data)
       if not vim.api.nvim_buf_is_valid(self.preview_bufnr) then
@@ -413,14 +403,16 @@ function Previewer.buffer_or_file:preview_buf_post(entry)
     set_cursor_hl(self, entry)
   end)
 
-  -- syntax highlighting moved to before
-  -- reading the file to prevent highlight
-  -- colors flickering
-  --[[ if self.syntax then
-    vim.defer_fn(function()
+  -- syntax highlighting
+  if self.syntax then
+    if self.syntax_delay > 0 then
+      vim.defer_fn(function()
+        self:do_syntax(entry)
+      end, self.syntax_delay)
+    else
       self:do_syntax(entry)
-    end, self.syntax_delay)
- end ]]
+    end
+  end
 
   self:update_border(entry)
 end