Music scanner scans entire music collection when new content added

[sa2000]

@leelynds

In the example, I added 3 albums by 2 artists . Both artists previously existed in the library, and were matched properly. The only way I can account for 8 scans of the library is this way:

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Jimi Hendrix -- 2 scans initiated, 2 new folders added to the artist
   Before London -- scan initiated - new folder added
   Get That Feeling -- scan initiated - new folder added

Jimi Hendrix Experience -- scan initiated - new folder added to the artist
   Re-Experienced -- scan initiated - new folder added
      Disc 1 -- scan initiated - new folder added
      Disc 2 -- scan initiated - new folder added

I can see the issue here - whilst we are not doing partial scanning we should at least consolidate the scans into one.

I am following this up.