// I don't think this line is necessary?
Preact internals #3: some fiddly little bits
Adam Solove
274

heh — that’s a recent one. Handles this case:

existing: A, B, C, D

new: A, C, D

We hit C in the loop and notice it’s the next node in the existing list, so removing the current node moves it into place. If the current node is elsewhere (eg: at the end of new), it’ll get re-added via insertBefore() later.

Removing the line actually works totally fine, it just can cause an unoptimized diff for single child removals, which are quite common.

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