53fa35096f
Previously there was a tx cache that you passed in as part of the sync request. This seems bad and the example show'd that you should copy all your transactions from the transaction graph into the sync request every time you sync'd. If you forgot to do this then you would always download everything. Instead just do a plain old simple cache inside the electrum client. This way at least you only download transactions once. You can pre-populate the cache with a method also and I did this in the examples.
BDK Electrum
BDK Electrum extends electrum-client to update bdk_chain structures
from an Electrum server.