* [1/4] Split Query and Target, and make LocalStore/RemoteStore work with Target. (#4413)
* [2/4]LimitToLast: Make SyncEngine work with Target (#4491)
* [3/4] Implement LimitToLast (#4505)
* Drop acknowledged mutations in schema migration (#1818)
Drop acknowledged mutations in schema migration as part of removing held write acks.
Port of firebase/firebase-js-sdk#1149
* Change removeMutationBatch to remove a single batch (#1955)
* Update Firestore Generated Protos
* Adding UnknownDocument and hasCommittedMutations (#1971)
* Removing held write batch handling from LocalStore (#1997)
* View changes for held write acks (#2004)
* Held Write Acks Unit Test Fixes (#2008)
* Held Write Ack Removal Spec Tests (#2018)
* Fix integration test
Port of: https://github.com/firebase/firebase-js-sdk/pull/559
Should address #772 once released.
getNextMutationBatchAfterBatchId() was not respecting
highestAcknowledgedBatchId and therefore we were resending writes after the
network was disabled / re-enabled.
This ensures FSTRemoteStore always tries to connect at least twice before surfacing an FSTOnlineStateFailed
event to external code (which may trigger gets to fail, cached data to be surfaced, etc.).