NSGeometry: complete NSIntegralRectWithOptions

[DTW-Thalion]

NSIntegralRectWithOptions did not implement its full contract:

• The NSAlignWidth*/NSAlignHeight* options were ignored; it always aligned both the minimum and maximum edge of each axis.
• It never validated the options, so a set that does not select exactly two of an axis' minimum edge, maximum edge and size silently returned a rectangle instead of raising.
• NSAlignRectFlipped was not handled.
• An empty or zero-size rectangle was collapsed to {0,0,0,0} rather than aligned in place.
• A nearest tie used round(), which rounds a negative half away from zero, instead of towards positive infinity.

Each axis is now aligned from exactly two of its minimum edge, maximum edge and size (raising NSInvalidArgumentException otherwise); an inward option rounds an edge toward the interior of the rectangle, outward away from it, nearest to the closest unit with a tie towards positive infinity (negative infinity for a Y edge under NSAlignRectFlipped); and an empty or zero-size rectangle keeps its aligned origin.

Every option combination, the flipped tie, the empty/zero-size handling and the exception were checked against Apple Foundation on a macOS runner. The behaviour is exercised by a new NSIntegralRectWithOptions set in Tests/base/Functions/NSGeometry2.m (7 of its assertions fail against the previous implementation).

[fredkiefer]

With that change in place you could rewrite your gui change to use this function.

[DTW-Thalion]

Thanks. Once this is in, I will rewrite -[NSView backingAlignedRect:options:] to call NSIntegralRectWithOptions instead of the private alignment helper it uses now.