These events occur when an item is inserted or removed by onTransact(),
so both for insertions/removals done through the MetaList mutators and
insertions/removals done by any other means.
We have to gather these events and batch them up because we have to allow
offset translation and index recomputation to occur first (otherwise
calling .getOffset() and .getIndex() on inserted items doesn't work).
Change-Id: I74a9a21398eca4e9afd7148171af20d439cf7ebd
Add .insertMeta() and .removeMeta() methods to insert and remove
metadata through the meta list. For convenience, there is also a
.remove() method in MetaItem that wraps around removeMeta().
Also rename insertItem() and removeItem() to addInsertedItem() and
deleteRemovedItem() to avoid confusion, and make the MetaList
constructor take a dm.Surface rather than a document so we can call
change().
Change-Id: I4b62a3109404cfd56f5de68938e1db908b03e678
A MetaList is a collection of MetaItems representing all of the
metadata in a ve.dm.Document, and it updates itself live as the
underlying document changes.
Currently this interface is read-only, I'll add mutators next.
Change-Id: If7bfc9563af37e22dcdca9a682d6decc2f6f1872