bug#8927: 24.0.50; Flaw in C-x v u

[Richard Stallman]

    > it has just created it. The fix for your problem would presumably be for
    > vc-revert to only kill the buffer if it did not exist beforehand.

    Right, that's the least we can do.

If C-x v u does make and show a diff, it should do that in a
different buffer, so as to preserve the old contents of *vc-diff*.
Keeping that buffer but wiping its contents does not fix the problem.

-- 
Dr Richard Stallman
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