There are some mod_quiz generator issues where the new chain
of dependencies between completion settings was not being observed.
This patch just ensures that the now 3 chained settings are
enabled together (or new quiz options logic will proceed to
disable them).
New module functions quiz_get_group_override_priorities() and
lesson_get_group_override_priorities() to calculate the priorities
of group overrides for a quiz/lesson activity.
There are several improvements over what we had before:
1. We track all the questions seen in the the student's previous
quiz attempts, so that when they start a new quiz attempt, they get
questions they have not seen before if possible.
2. When there are no more unseen questions, we start repeating, but
always taking from the questions with the fewest attempts so far.
3. A similar logic is applied with variants within one question.
There is lots of credit to go around here. Oleg Sychev's students Alex
Shkarupa, Sergei Bastrykin and Darya Beda all worked on this over
several years, helping to clarify the problem and shape the best
solution. In the end, their various attempts were rewritten into this
final patch by me.
This commit is actually the joint work of Mahmoud Kassaei, Colin
Chambers and Tim Hunt from The Open University. We could only use one
persons name for the commit, and this time Colin gets the credit/blame.
The goal of this work was to increase usability, and also clean up
the page enough that it will be possible to add new features in future.
Display of mod/quiz/edit.php is now entirely generated by
mod_quiz\output\edit_renderer. This uses a helper class
mod_quiz\structure to provide details of the structure of the quiz, and
mod_quiz\repaginate to alter that structure. (Acutally, there are still
some modification methods on mod_quiz\structure. Expect that to be
cleaned up in future.)
The new code uses much more ajax, and there are new scripts
mod/quiz/edit_rest.php and mod/quiz/repaginate.php to handle this.
(Again, don't be surprised if those two scripts get merged in future.)
Also questionbank.ajax.php (which may, in future, be made more generic,
and moved into the core question bank code.)
Most of the new JavaScript code has intentionally copied the way things
are done when editing activities on the course page.
As a result of this, mod/quiz/editlib.php is now much shorter than it
was. (In future, expect the remaining code in here to move into
mod/quiz/classes.)
