Fix snapped implementation, it was not snapping size correctly

util/math/rect3i.h

@@ -239,7 +239,10 @@ public:
 	}
 
 	inline Rect3i snapped(int step) const {
-		return Rect3i(pos.floordiv(step) * step, size.floordiv(step) * step);
+		Rect3i r = downscaled(step);
+		r.pos *= step;
+		r.size *= step;
+		return r;
 	}
 };
 

util/math/vector3i.h

@@ -91,6 +91,12 @@ struct Vector3i {
 		z -= other.z;
 	}
 
+	_FORCE_INLINE_ void operator*=(const int s) {
+		x *= s;
+		y *= s;
+		z *= s;
+	}
+
 	_FORCE_INLINE_ Vector3i operator-() const {
 		return Vector3i(-x, -y, -z);
 	}