Using the same rationale as for its parent class, Diff: ideally there
should be some kind of factory for diffs, but currently, there isn’t.
Reuse the same task ID for the todo comment (T257472), as we think it’s
appropriate for both “diff” classes, Diff and WordLevelDiff.
Note that the TwoColumnConflict extension already uses this class as if
it were newable.
Bug: T311224
Change-Id: If2553d6ebc96636b83df8f58e0420dd7eb6ba5af
Co-Authored-By: Michael Große <michael.grosse@wikimedia.de>
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