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Sean KinseyandPaul O’Shannessy
f1a4b84e4c
It is valuable to know when the number of children in a TransitionGroup is going to increase or decrease, since we might want to apply extra animations. For instance, when used with overflow:auto, we might want to apply different css based on it overflowing or not - to do this we need to calculate this after new nodes has entered and after nodes has been removed.