Unknown error + transaction creation failed with coin control from transparent to spark

[rgbduckface]

Describe the issue

When sending from transparent to spark in Firo-QT using coin control an unknown error appears.

1. select utxos (using coin control)
2. copy after fee amount
3. select receiver spark address
4. paste the after fee amount
5. click send
   This appears:

after clicking ok, this appears:

Selecting "subtract fee from amount" makes the transaction go through, but this creates a small transparent change transaction as well. Which is not desired. The goal is to spend the whole transparent firo to spark.

Local setup

Debian 11 + Firo-QT: Firo Core version v0.14.14.1-g7f5632432 (64-bit)

Nothing useful appears in the debug.log when attempting this.

[reubenyap]

Thanks will double check

[rgbduckface]

So another method that works is to just enter the entire balance of the selected utxos (so not the after fee amount) and then select "subtract fee from amount", then the transaction goes through.

Its basically the same thing in a way, but also the other way described before should work as well, or at least give some error info instead of this generic error posted above.

So probably some issue in the fee calculation method when using coin control, I noticed that:

• calculated with coin control (the calculated after fee amount) the fee was 0.00000858
• sending with subtract fee from amount the fee was 0.00001125

So there is some issue here...