R0 = Base
R2 = Window handle
R3 = Icon handle
R4 = Maximum value
R5 = Step
Exit:
R0 = New value
Converts the string in the icon to an signed
integer, adds 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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