lib/assets/scripts/vendor/codemirror/codemirror.js
function makeLine(text, markedSpans, height) {
    var line = {text: text, height: height};
    attachMarkedSpans(line, markedSpans);
    if (lineIsHidden(line)) line.height = 0;
    return line;
  }
function makeLine(text, markedSpans, height) {
    var line = {text: text, height: height};
    attachMarkedSpans(line, markedSpans);
    if (lineIsHidden(line)) line.height = 0;
    return line;
  }
Line objects. These hold state related to a line, including highlighting info (the styles array).