Fix potential updateTrackingAreas bug with tooltips and cells #180
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In one of my personal projects, I found that removing all
NSTrackingAreaobjects for a view could cause tooltips to stop working. This pull request reflects the fix for that -- don't remove all tracking areas! Even if the tooltip bug doesn't necessarily exist forJNWCollectionViewCells, this should speed up theupdateTrackingAreasfunction slightly by removing the array copy.