Comment #1 on issue 149 by [email protected]: Bug in history management with multiple file buffers
http://code.google.com/p/vim/issues/detail?id=149

This is expected behavior. By default Vim discards undo history when you abandon a buffer. You have a few options:

1. Set the 'hidden' option so Vim doesn't abandon the buffer.
2. Set the 'undofile' option so Vim saves the undo information in a file (also lets you quit Vim and relaunch Vim and keep the undo info). 3. Open a new window or tab for file B instead of switching buffers in the same window.

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