Windows taskbar unhides when used with '-a' switch

If `HashTWM` is run, say, so 'hashtwm.exe -a mintty', and another program outside of `HashTWM` is run , say Explorer, Explorer's window gains focus and as it does the Windows' Taskbar tile for `mintty` flashes and if Taskbar is set to be hidden it pops up. `mintty` remains unfocused though. 
