Mp4FieldKey.PART_OF_GAPLESS_ALBUM doesn't have a length set

[Dan Gravell]

It looks like all Mp4FieldKeys which have a Mp4TagFieldSubType of type BYTE have a fieldLength set, except for PART_OF_GAPLESS_ALBUM.

If I set PART_OF_GAPLESS_ALBUM and try to commit the file, I get:

pgap:0:Dont know how to write byte fields of this length

I think that PART_OF_GAPLESS_ALBUM should have a byte length of 1.

Note there's actually a comment in Mp4TagByteField suggesting this.

[IJabz]

You are probably right but had a quick look but cant see what to change, please create a pull request.