Function onKey

public/js/filePreview.js:738–742

(e)

      prevBtn.addEventListener('click', (e) => { e.stopPropagation(); navigate(-1); });
      nextBtn.addEventListener('click', (e) => { e.stopPropagation(); navigate(+1); });
      const onKey = (e) => {
        if (!document.body.contains(overlay)) { window.removeEventListener("keydown", onKey); return; }
        if (e.key === "ArrowLeft")  navigate(-1);
        if (e.key === "ArrowRight") navigate(+1);
      };
      window.addEventListener("keydown", onKey);
      overlay._onKey = onKey;
    }