Grid cell sizes adapt to the slider
The representedImage would return the stored object and display a generic file icon as the title image. Return an actual image instead.
(May require one to re-add their cover art)
Cache the selection layer to prevent infinite loop
CATransition init --> dirty layers --> LayerForType --> CATransition init --> dirty layers -->  LayerForType --> CATr…
Allow grid view to inappropriately fully reload when we only need to reload indexes.
(Fixes cover art updating amongst probably other things)
Merge pull request #754 from evanschoffstall/NewGridView

NewGridView bug fixes