SciCalc bug

If you click on an icon and hold the mouse button down then digits are entered, and functions executed, twice. There are two reasons for this:

The icons all have button type click/drag and the code that handles mouse clicks only checks which mouse button it is. It doesn’t inspect the type of click so responds to both Select pressed and Select dragged.

The icons all have button type click/drag

Sounds like there’s your problem right there.