REPRODUCE: 1. Type 1+2*3 2. Press Enter Expected: 7 Observed: 9 ADDITIONAL INFORMATION I am aware, that this is how old-school physical calculators used to work, but I think it is impractical in a modern Desktop, for the meta discussion, visit Ticket #463809.
This is not what the calculator widget is for. If you want to want to perform more complex math, other widgets can help you there; as an example, the Application Launcher is able to do even very complex maths through the search box, allows editing the input, and allows to be pinned to stay open. The calculator widget is not meant to be that.