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78057a945e
Originally we destroyed the oldValue by incrementaly copying over portions of the newValue into the oldValue during dirty-checking, this resulted in oldValue to be equal to newValue by the time we called the watchCollection listener. The fix creates a copy of the newValue each time a change is detected and then uses that copy *the next time* a change is detected. To make `$watchCollection` behave the same way as `$watch`, during the first iteration the listener is called with newValue and oldValue being identical. Since many of the corner-cases are already covered by existing tests, I refactored the test logging to include oldValue and made the tests more readable. Closes #2621 Closes #5661 Closes #5688 Closes #6736