[0.2.1] Reloading cell while others move around it crashes

[tomlokhorst]

Example:

let previous: [(String, String)] = [
  ("41", "Alpha 1"),
  ("42", "Beta 1"),
  ("43", "Gamma 1"),
  ("44", "Delta 1"),
]

let new: [(String, String)] = [
  ("40", "Hello!"),
  ("41", "Alpha 2"),
  ("43", "Gamma 2"),
  ("42", "Beta 2"),
  ("44", "Delta 2"),
]

previous.diff(new, identifierSelector: { $0.0 })

Results in this diff:

ElementDiff(deleted: [], inserted: [0], moved: [0: 1, 1: 3, 3: 4], unmoved: [2])

Which causes this crash:

*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'attempt to perform an insert and a move to the same index path (<NSIndexPath: 0xc000000000600016> {length = 2, path = 0 - 3})'

I guess this means we can't blindly reload cells. I'll remove that feature for now.