ZopeUndo.Prefix is still used

Hi.

I saw Jim asking about the current state of ZopeUndo.Prefix.

From what I can tell, it's still used - probably in the same way it has
been for a long time. The ZopeUndo.Prefix code these days lives in
https://github.com/zopefoundation/ZopeUndo/blob/master/src/ZopeUndo/Prefix.py.

The code was split out into its own project, so that one could install
only this bit into a ZEO server Python environment, without pulling in
all of Zope2.

On the Zope2 side, it's used from
https://github.com/zopefoundation/Zope/blob/master/src/App/Undo.py#L71,
specifically it calls storage.undoInfo with a Prefix-based specification
for both user_name and description and later calls storage.undoMultiple
with the resulting ids.

We could simplify this on the Zope2 side, by simply dropping the
specification/filter and restrict the Undo ZMI page to only be available
on the ZMI root object, instead of being contextually available on each
ZMI folder.

Would that help?

Hanno

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