Using Article::view to implement ItemView would probably fix this, see bug #37682

fixed via bug 37682

This is very cool, thanks! Is there a way to get a header saying "this is an old version" or something? Open a new item or reopen this bug for that?

Actually, such a warning should be shown exactly if and when it's shown for wikitext pages... is that not the case?

Ah, note that the javascript editing stuff may hide or remove some things from the top of the page! Perhaps open a bug report for that, it needs more investigation.

Try to turn off JS and view an old revision.

I cannot reproduce your suggestion, i.e. switching of JavaScript does not bring the note back. Then again, right now the viewing an old item seems to be broken anyway -- is that due to the revert in the morning?

yes, the revert undid support for this. reopening.

Need tests once the dependencies are closed.

Verified in Wikidata demo time for sprint 8