infinite lists

[WebReflection]

The current sameList related logic works well for finite lists but re-append same nodes when the length changes.

While it's not too relevant to cover less items than before, the infinite scrolling might be quite a use case.

TODO

• sameList should return different values if the operation is substitute, same, or similar, where latter means that up to N live nodes lists are same and the new fragment should contain less nodes
• update the content accordingly, dropping nodes in the lower range, adding nodes if needed after
• profit

[WebReflection]

• substitute means nodes are already different at index 0
• same means there's nothing to do
• similar means there is a known index to start replacing from

Apologies @marcoscaceres I forgot to create a branch and when I've pushed was already too late.

If there's anything obviously wrong in my last commit, please let me know.

Thank you!