Prevent Duplicate Key Error when 'key' is passed into constructor. #3
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This change fixed an error with a duplicate key when the LinkWell widget is constructed passing in the 'key' value.
Error was:
Multiple widgets used the same GlobalKey.
This error never occurred unless the caller passed in a Key. It is easy in the old version to create this problem by just passing in a key in the constructor. The new version works correctly when passing in a key.