Calculates the union of two rectangles. The union of rectangles src1 and src2 is the smallest rectangle which includes both src1 and src2 within it. It is allowed for dest to be the same as either src1 or src2.

Note that this function does not ignore 'empty' rectangles (ie. with zero width or height).


src2 GdkRectangle*
dest GdkRectangle

return location for the union of src1 and src2