Function fastPoll

static/js/codemirror/codemirror.js:1329–1338

(cm)

  }

  function fastPoll(cm) {
    var missed = false;
    cm.display.pollingFast = true;
    function p() {
      var changed = readInput(cm);
      if (!changed && !missed) {missed = true; cm.display.poll.set(60, p);}
      else {cm.display.pollingFast = false; slowPoll(cm);}
    }
    cm.display.poll.set(20, p);
  }

  // prevInput is a hack to work with IME. If we reset the textarea
  // on every change, that breaks IME. So we look for changes