[Calculator app] Equals should cancel previous operators and return result

[Alan Pope 🍺🐧🐱 🦄]

Type the following:-

1 + 2 + 3 + =

I'd expect to get 6, but I get 0.

[Alan Pope 🍺🐧🐱 🦄 (popey)]

Further to this (probably related, so I'm not filing a new bug). There is an expectation that pressing = more than once will repeat an operation.

So:-

1 + 2 = should return 3
1 + 2 == should return 5
1 + 2 = = = should return 7
etc.

[Riccardo Ferrazzo (f-riccardo87)]

Isn't more correct if 1+2+= returns "error" instead of removing the last operator?

[Riccardo Ferrazzo (f-riccardo87)]

actually i'm planning to trigger an error message if the syntax is wrong and allow the user to use the previous result either clicking on it (when it is on the memory plot) or clicking an operation sign after the result (example: [1])

[1] 3 + 2 = 5 * 2 = 10

[Riccardo Ferrazzo (f-riccardo87)]

Here is the proposed solution for continuing calculations

[Ubuntu Phone Apps Jenkins Bot (ubuntu-phone-apps-jenkins-bot)]

Fix committed into lp:ubuntu-calculator-app at revision 36, scheduled for release in ubuntu-calculator-app, milestone alpha-1

[Christina Li (christina-li)]

Hi Riccardo, when a user continues with the calculation, the equals sign should be hidden. Ie there should only be one equals sign at a time and that should be the final results one.

See attached image