Currency rates in a transaction – enhancements

[Kaligula0]

When entering a transaction between accounts that use different currencies a popup appears, where user can enter currency rate.

1. there should be a button to invoke the popup, because it appears only after the account is selected/changed, and user cannot open the popup after he closes it
2. in the popup, it would be nice if the amount in the second currency was updated live, when user enters the rate; (and vice-versa)

Software specifications

• GnuCash Android version: 2.4.0-dev3_r4caab7a
• System Android version: 14
• Device type: SM-S901B