Function lineAtHeight

static/js/codemirror/codemirror.js:4605–4622

(chunk, h)

  }

  function lineAtHeight(chunk, h) {
    var n = chunk.first;
    outer: do {
      for (var i = 0, e = chunk.children.length; i < e; ++i) {
        var child = chunk.children[i], ch = child.height;
        if (h < ch) { chunk = child; continue outer; }
        h -= ch;
        n += child.chunkSize();
      }
      return n;
    } while (!chunk.lines);
    for (var i = 0, e = chunk.lines.length; i < e; ++i) {
      var line = chunk.lines[i], lh = line.height;
      if (h < lh) break;
      h -= lh;
    }
    return n + i;
  }

  function heightAtLine(cm, lineObj) {
    lineObj = visualLine(cm.doc, lineObj);