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This method modifies the rectangle so that it is h units larger on both the left and right side, and v units larger at both the top and bottom.
The new rectangle has (x - h, y - v) as its top-left corner, a width of width + 2h, and a height of height + 2v.
If negative values are supplied for h and v, the size of the rectangle decreases accordingly. The grow method does not check whether the resulting values of width and height are non-negative.