two heads have no common ancestor

[Rob Landley]

> I have a repo where the two heads have no common ancestor, which I
> thought was impossible.

So did I until I did it, way back when.

In my case it was because I accidentally did a checkin as root which
created new files under .hg that belonged to root, and then a later commit
as a normal user couldn't write to those files but didn't notice.

I think that particular one was fixed (it notices now), but there might be
other ways to do something similar?

Rob
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