Merge "ui: Fix Rect::reduce" into nyc-dev

        if (!(mask & (mask - 1))) {

            // power-of-2, i.e.: just one bit is set

            if (mask & 1) {

                result.right = exclude.left;

                result.right = min(result.right, exclude.left);

            } else if (mask & 2) {

                result.bottom = exclude.top;

                result.bottom = min(result.bottom, exclude.top);

            } else if (mask & 4) {

                result.left = exclude.right;

                result.left = max(result.left, exclude.right);

            } else if (mask & 8) {

                result.top = exclude.bottom;

                result.top = max(result.top, exclude.bottom);

            }

        }

    }