Fixes recursion of redraw #1
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This fixes an issue where in Swift 4.1 the
didSetmethod ofdatamethod was called continuously if any of the code the redraw calls mutates anything in the array of data items, see swift bug report here.This is fairly simple to fix by having the public
dataproperty being a calculated var which uses an internal private equivalent used by the methods in CollectionViewController.It's possible we will be able to undo this change in a later version of swift.