Increments currTick by the specified number of tick steps. Subclasses may sometimes need to override this method to modify the actual number of tick steps in order to ensure that the associated tick labels are stable when scrolling.
@return the number of tick steps that were *actually* incremented;typically, this value will be the same as the numTickSteps input parameter, but in the aforementioned subclass override case, a different value could get returned (the typical case for this is a date near the end of a month).
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