A minor bug in sending/coin control I noticed.

If you go into "Coin Control" and deselect everything (or only select things that have a 0.00 balance), you can still successfully create a transaction if your amount sent is below your wallet balance. You are not prompted with the "Coin Selection Failure: Coin selection failed with error: spend value > usable balance" as expected.

I'm not sure the logic but it seems to just pick from any coins in the wallet, although to be fair there is only P2PKH outputs in what I'm testing.