Before this patch, the checker in the timer will stop only when
actions array is empty.
When we call play more than once, it will clear the timer first,
then push filtered new actions and start the timer again. If
all of this happened in a frame, the checker which should be
cleared may found actions array is not empty and keep check.
So this patch we use timer.raf to hold raf's handle and cancel
it when clear was called.
In this commit we switched the sandbox strategy to use iframe's
sandbox attribute. Indeed we do not need delegate event anymore,
but need to add some styles into the iframe.
The details were documented in the sandbox part of internal design.
When add new nodes, we may use insertBefore API to insert node before
its next sibling. But the sibling may not in the DOM tree at that
moment if it was in the missing node map.
This patch include a breaking change to the recorder's event data.
We used to consider mirror.getId will always return the id of the
target node because we keep serialize every node. But if we call
mirror.getId before serialization then bug happened. This could
happen when we get nextId of newly added nodes if its next sibling
was also newly added.
So we have to return -1 as the id of node which was not serialized
and when we building added nodes in the replayer we should handle
this.
For example, nodes el1, el2 were added together and el1's nextId
will be -1 since el2 was not serialized at that moment. Now we
call el1 as a 'missing next node' and not append it into the DOM
tree after building, instead we store it in a missingNextNodeMap.
After a added node in the same mutation was successfully appened
we will check whether it has a previous id and the id was pointed
to some nodes in the map, if so, we will insert that node before
it and delete the node from map.
