How to get undo functionality after :bnext

Hi,

I'm using version 7.3 on a Windows XP machine.

When editing multiple buffers, I do :bnext to get to the next buffer.
Unfortunately, when I return to that buffer or one of the previously
edited buffers, I can no longer "undo" the changes in the
corresponding buffer.

Is there a way to set it up so that even if I do :bnext that I can
still undo changes when I return to the same buffer? I think what is
automatically happening is that every time I do :bnext it is saving
the file, and somehow that is flushing the undo list.

Thanks!

--
You received this message from the "vim_use" maillist.
Do not top-post! Type your reply below the text you are replying to.
For more information, visit http://www.vim.org/maillist.php