/**
* Create a fake question to be displayed in place of a question that is blocked
* until the previous question has been answered.
*
* @param int $slot int slot number of the question to replace.
* @return question_definition the placeholde question.
*/
protected function make_blocked_question_placeholder($slot)
{
$replacedquestion = $this->get_question_attempt($slot)->get_question();
question_bank::load_question_definition_classes('description');
$question = new qtype_description_question();
$question->id = $replacedquestion->id;
$question->category = null;
$question->parent = 0;
$question->qtype = question_bank::get_qtype('description');
$question->name = '';
$question->questiontext = get_string('questiondependsonprevious', 'quiz');
$question->questiontextformat = FORMAT_HTML;
$question->generalfeedback = '';
$question->defaultmark = $this->quba->get_question_max_mark($slot);
$question->length = $replacedquestion->length;
$question->penalty = 0;
$question->stamp = '';
$question->version = 0;
$question->hidden = 0;
$question->timecreated = null;
$question->timemodified = null;
$question->createdby = null;
$question->modifiedby = null;
$placeholderqa = new question_attempt($question, $this->quba->get_id(), null, $this->quba->get_question_max_mark($slot));
$placeholderqa->set_slot($slot);
$placeholderqa->start($this->get_quiz()->preferredbehaviour, 1);
$placeholderqa->set_flagged($this->is_question_flagged($slot));
return $placeholderqa;
}