Calculate the result when the = key is pressed

Submitted by Robert Roth @robertroth

Link to original bug (#662451)

Description

When I use a mouse pointer to do 2+2= I get 4, but when I use a keyboard I get 2+2= typed in the entry field. In basic mode (default), I expect normal calculator behaviour, not algebraic behaviour. After this, you have to press Enter to display the result.

The expected result would be to display the result when pressing the = key, just as when you press the Enter key.

Version: 6.2.x