Thanks Ben
> :echo string(undotree())

Indeed, 
:echo undotree()
gives a lot of raw data.
> That's where the undo plugins come in.
After your previous mail, I installed Gundo and it worked just as
advertised. Regrettably, despite 988 entries, it did not contain
my missing data :(
> 
> You can try making sure the file is saved in its current state, making sure 
> the undo file is written, then installing one of those plugins and starting a 
> new Vim instance to edit the file. Ignore the swap exists error, you can 
> always quit without saving in the new Vim. Then you should be able to 
> navigate through your undo information more easily.

Actually, I was surprised to fund that Gundo worked without
restarting my session.

Not often that I lose data in vim.

Thanks again for your help Ben.

Eric

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