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.
a #GdkRectangle
return location for the union of @src1 and @src2
See Implementation
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.