Function isLine

static/editor.md/lib/codemirror/lib/codemirror.js:2004–2004

(doc, l)

    else return pos;
  }
  function isLine(doc, l) {return l >= doc.first && l < doc.first + doc.size;}
  function clipPosArray(doc, array) {
    for (var out = [], i = 0; i < array.length; i++) out[i] = clipPos(doc, array[i]);
    return out;