Oh, and also: even if the 'create/destroy matching text' issues are resolve, simply leaving the Find bar open on blur is also tricky because of NJ's changes that detach it from the Editor's DOM and put it up in the global toolbar DOM.  At the least we'd need additional logic to hide the Find bar when the editor it's attached to is hidden (or ideally, logic to swap in/out different editors' search state as you switch editors).