[whatwg/fullscreen] Remove from top layer synchronously for not connected elements (#128)

If the fullscreen element is not connected anymore dispatch
event and unfullscreen the element right away.

This allows an element that is being removed to see that it isn't the
fullscreen element synchronously.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fullscreen/pull/128

-- Commit Summary --

  * If the fullscreen element is not connected anymore dispatch

-- File Changes --

    M fullscreen.bs (9)

-- Patch Links --

https://github.com/whatwg/fullscreen/pull/128.patch
https://github.com/whatwg/fullscreen/pull/128.diff

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