SUMMARY When adding or editing a transfer between two accounts of different currency, an "Exchange Rate/Price Editor" is shown. It should incorporate ability to download a historical price for the pair and the date of transaction. Additionally, the widget should show if an existing currency pair for the date had been previously provided and therefore already shown. STEPS TO REPRODUCE 1. In ledger, add a transfer between account denominated in different currencies OBSERVED RESULT Exchange Rate/Price Editor is shown, but only manual entry of exchange rate is possible. EXPECTED RESULT If an existing rate was known and presented, user should be notified. It should also be possible to retrieve the rate from the online source.