R0 = Base
R2 = Window handle
R3 = Icon handle
R4 = Minimum value
R5 = Step
Exit:
R0 = New value
Converts the string in the icon to an signed
integer, subtracts the step, and puts it
back. Updates the screen as necessary. The
value will not go beyond the value passed in
R4, and the new value is returned in R0.
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