WavTagWriter may not write if existings tags replaced with new tags rather than edited

When you read a WavFile the tag contains the existing ID3v2tag (if one exists) and if you edit the contents of this tag and then write changes to file everything is okay, but if you replace with a new Tag (perhaps because tag was ID3v23 and you wanted ID3v24Tag) write may fail because the startLocation and endLocation fields not yet and the code makes incorrect assumptions that the tag currently within the WavTag is the same as the one on disk.

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