I thought client persist was via the url not cookies, but as I said I never
really used it.

It might be handy to have a persist that used a URL argument. That's how I
do paging with something like

url?table1.page=1 where table1 is the component id. In the case of tree that
might be

url?tree1.nodes=1,5,7

Perhaps
@Persist("RequestParameter")

The issue is the URL gets too long and bookmarking is iffy since the id can
change.

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