Only do a full update() from addArtwork() if something changed #560
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Avoid doing a full update (and the subsequent notifyChange()) if nothing actually changed. This removes cases where there's just a single image and it is unconditionally changed every time onLoadRequested() is called, causing an infinite loading loop.
When developers specifically call update(), we always call notifyChange() in case they are sorting by DATE_MODIFIED and want an updated list.
Fixes #559