Undoable file reload

Hi,

For a long time now, I have been using Vim alongside VisualStudio by
doing all my editing in Vim and compiling and debugging in VS. If I
save a file in Vim and it is open in VS, VS asks me if I want to
reload, and I say yes. I know some people would find working this way
clumsy, but I actually have no problem with it.

Now I am starting to use Eclipse for Java, and I am very impressed
with all the conveniences it provides in terms of completing and
creating code, and I am considering a mode of about half Eclipse and
half Vim, using Vim for regular text-editing tasks and Eclipse for its
code completion, etc. The problem is that if I save something from
Eclipse and then reload the file in Vim, I lose all my undos to that
point. What I would like is the possibility to undo the reload
itself, and I'm considering implementing this at the Vim code level.
I have two questions:

1)Does this or something similar already exist, and I'm just missing it?

2)If not, is it doable, and what would I have to change?

I suppose I would want this to be some kind of option, like :set
undoablereload, say, so that the default functionality would still be
available.

Thanks very much.

Ephraim

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