       // nothing
          } else {
            let tabIndex = tabs.indexOf(focusedTab);
            if (tabIndex === 0) {
              focusedTab = urlMesh;
            } else {
              tabIndex--;
              focusedTab = tabs[tabIndex];

              if (tabIndex < listMesh.scrollIndex) {
                listMesh.scrollIndex = tabIndex;
              } else if (tabIndex > listMesh.scrollIndex + 4) {
                listMesh.scrollIndex = tabIndex - 4;
              }
            }
          }
