lib/assets/scripts/vendor/codemirror/codemirror.js
function loadMode(cm) {
    var doc = cm.view.doc;
    cm.view.mode = CodeMirror.getMode(cm.options, cm.options.mode);
    doc.iter(0, doc.size, function(line) { line.stateAfter = null; });
    cm.view.frontier = 0;
    startWorker(cm, 100);
  }
function loadMode(cm) {
    var doc = cm.view.doc;
    cm.view.mode = CodeMirror.getMode(cm.options, cm.options.mode);
    doc.iter(0, doc.size, function(line) { line.stateAfter = null; });
    cm.view.frontier = 0;
    startWorker(cm, 100);
  }
STATE UPDATES Used to get the editor into a consistent state again when options change.