Function getBidi

external/.scrollLibs.js:4025–4029

(ch, partPos, invert)

    }

    function getBidi(ch, partPos, invert) {
      var part = order[partPos],
        right = part.level == 1
      return get(invert ? ch - 1 : ch, right != invert)
    }
    var partPos = getBidiPartAt(order, ch, sticky)
    var other = bidiOther
    var val = getBidi(ch, partPos, sticky == "before")