Hi MC experts,
when spawning history of a dirty package,
then selecting the <working copy>,
then trying to view changes from one of the ancestors via pop up menu,
the operation ends up with a 'MessageNotUnderstood:
UndefinedObject>>snapshot'.

The problem is that:

MCWorkingHistoryBrowser>>selectedSnapshot
^ self snapshotForInfo: self selectedInfo

will use a MCWorkingCopyAncestry as the selectedInfo...
But a MCWorkingCopyAncestry lacks essential messages of a regular
MCVersionInfo, like versionName etc...
This will cause an Error, caught at upper level, and result in nil (no
repository holds the 'working copy', there is no point in searching...).

I have no idea how to fix it, presumably we should catch early that we're
dealing with 'working copy' and use appropriate snapshot for it...

I do not know if it was broken recently or if it never worked, but this is
a useful feature when there are several ancestors, so help would be
appreciated.
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