Function mid

public/js/folderManager.js:1815–1815

(a, b)

    }

    const mid = (a, b) => ({ x: (a.x + b.x) / 2, y: (a.y + b.y) / 2 });
    const start = mid(pts[pts.length - 1], pts[0]);
    let d = `M ${start.x} ${start.y}`;
    for (let i = 0; i < pts.length; i++) {