Since the method is deferred we need to do extra guesswork for possible
situtations where the name has changed because we don't have the
privilege to calculate the name in-line when content is deleted.
I tried to account for all cases as we have in our test coverage. I
hope that if there are edge cases they are false positives, and we are
firing extra name changes and not the opposite.
Original Revision: https://phabricator.services.mozilla.com/D223877
Differential Revision: https://phabricator.services.mozilla.com/D225716
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