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Right now interactions between focus and selection are UA-dependent. Maybe it should stay that way but it's worth investigating. e.g. WebKit automatically focuses the element with selection when the user types, moves caret, etc... whereas Trident and Gecko moves selection to wherever focus is.
This causes bugs like https://bugs.webkit.org/show_bug.cgi?id=38696 for WebKit
Thanks for the report. I'll look at some point, when I have the time.