[ZODB-Dev] RelStorage breaks History tab

[Chris Withers]

Hi Shane,

It looks like RelStorage (1.4.2 in my case, connected to MySQL, ZODB 
3.9.6 on Zope 2.12.7) breaks the history tab.

To reproduce, I set up a stock ZODB with a history-preserving storage, 
went in and edited the index_html page a few times.

I see the resulting transactions in both the root Undo tab and the Undo 
tab of the page template, but not in the History tab of the page template.

Any ideas?

Chris

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