Error in tool_offsetview.py

If no one else is having this problem, then it's clearly just me. There's no point in pursuing this further.

That's strange, though, because I downloaded the entire program from Git, compiled it, and the same problem persists. Older master builds don't have this problem.
With a freshly compiled program, I open one of the default qtdragon configurations, open some gcode, run it, press stop, and the program stops, but the spindle doesn't turn off. I have to press stop again to turn the spindle off.