Mouse-click confirming date in calendar chooses a transaction

[humdingerb]

• To create a new transaction, click the calendar button
• Choose a date in the calendar window by double-clicking

-> The window closes, the chosen date is inserted in the Date field, but a click from the double-click reaches the main window, choosing the transaction under the mouse pointer. As a result, the date of that transaction is inserted, undoing the date-choosing via calendar...