[Gecko Bug 1628770] Restrict "empty editable block" bits to contenteditable roots. #22849
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This is what other UAs do.
Differential Revision: https://phabricator.services.mozilla.com/D70423
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1628770
gecko-commit: 2ea41c3546d3f529bb4a87c31862cdf048cc8284
gecko-integration-branch: autoland
gecko-reviewers: jfkthame