Update method no longer updates wallet balance

[mtkgeek]

This seems to be an issue with the latest release. After a transaction, calling the wallet's update method updates the transaction history of the wallet but the balance remains the same. It only changes after the app is restarted and/or wallet is rebuilt from keys again.

[reaster]

I've closed out the Fund 5 work, but let's leave this issue open for the Fund 7 refactor. The current API is not production quality, with no paging support, much less merging of data deltas. I'll look at how other frameworks handle this before I redesign the API.