Currently the only use is the quiz Redo question button, and that would
be much better placed in the feedback area, not least for langages where
the button label needs to be longer.
This feature is designed for use on pracice or formative quizzes.
It is available for quizzes that use Interactive or Immediate feedback
behaviour.
If the teacher turns this on in the quiz settings, then once a student
has finished a question, they get a 'Redo question' button beside the
question. If they click it, then the question they finished is replaced
by a new one so they can try again to practise that particul skill or
bit of knowledge a bit more.
When randomisation is involved, the studnets will be given a question or
variant that they have not seen before if possible.
* A method to change the max mark for one question_attempt in the usage
* A method to replace one question in a usage with another, moving the
old question_attempt to the end.
* Methods to set and get metadata (string name value pairs) for each
question_attempt in the usage. This gets stored in the first step in a
way that should not interfere with anything else.
It was always a bit of a hack to use static methods on the
qbehaviour_whatever classes to return metadata about the behaviour. It
is better design to have real qbehaviour_whatever_type classes to report
that metadata, particularly now that we are planning to add more such.
For example, inheritance works better with real classes. See, for
example, the improvements in
question_engine::get_behaviour_unused_display_options().
This change has been implemented in a backwards-compatbile way. Old
behaviours will continue to work. There will just be some developer debug
output to prompt people to upgrade their code properly.
