[Bug 28865] Substraction doesn't work with arithmetic precedence

[Botond]

Public bug reported:
https://launchpad.net/malone/bugs/28865

Affects: gcalctool (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

Description:
Select arithmetic precedence and try to substract: you will see that X-Y=X for any numbers.
This can be observed in gcalctool-5.7.23 and 5.7.26. 5.5.41 works fine with Dapper.