/**
* Regrade a question in this usage. This replays the sequence of submitted
* actions to recompute the outcomes.
* @param int $slot the number used to identify this question within this usage.
* @param bool $finished whether the question attempt should be forced to be finished
* after the regrade, or whether it may still be in progress (default false).
* @param number $newmaxmark (optional) if given, will change the max mark while regrading.
*/
public function regrade_question($slot, $finished = false, $newmaxmark = null) {
$oldqa = $this->get_question_attempt($slot);
if (is_null($newmaxmark)) {
$newmaxmark = $oldqa->get_max_mark();
}
$newqa = new question_attempt($oldqa->get_question(), $oldqa->get_usage_id(),
$this->observer, $newmaxmark);
$newqa->set_database_id($oldqa->get_database_id());
$newqa->set_slot($oldqa->get_slot());
$newqa->regrade($oldqa, $finished);
$this->questionattempts[$slot] = $newqa;
$this->observer->notify_attempt_modified($newqa);
}