Is there even one confirmed instance of J.K.Rowling changing her mind about HP book detail to accomodate fans?
To be specific, I mean an instance where:
Rowling had a plan to write a specific detail in one of books #2-7 in one way.
There was a specific fan request/desire to have the detail turn out another way. Either mass-movement, or a few very vocal fans.
Rowling changed the detail to accommodate this request/desire.
Must be explicitly acknowledged as the cause of the change by Rowling.
I might be willing to consider nearly-certain circumstantial proof from another source (e.g. documented proof of original draft detail, and correctly-timed highly public pressure to change it) if nobody can give the example that is officially acknowledged, but the proof must be extra-convincing for me to accept the asnwer.
Limited to HP books 2-7.
Preferably something less than 100% trivial (e.g. color of Hermione's dress would be trivial. Who married whom or increased importance of Neville in latter books would be good example of non-trivial elements).