When a question migrated from another site is closed in the
receiving site, some operations are performed:    • The question
is closed, and locked   • Its answers are locked, and deleted
Re-opening the question just re-opens the question, but the
question still needs to be unlocked, and its answers need to be
unlocked, and undeleted.  Re-opening the question should
automatically do the other two operations automatically.
Clearly, that should not be done for answers that were already
deleted (or deleted and locked) before the question was closed.
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