What happens is that adding random questions used to set the timestamps
of these questions to the same value. This is fine in normal operation,
but it stuffs up the backup of that course, overwriting the question.
When the course is restored, the missing questions cause quizzes to
have lots of red notices like "Question not found".
Anyhow, this patch should safely fix older installations that may have
these duplicate questions lying around.
THANKS ELOY!
This makes it possible for students to take a tedious quiz, save it half-way and have it graded. The student can then, at a later point, get back to the quiz and have the previous answers already filled in and graded. The student can then continue with the remaining questions as well as redo all the answers that got wrong at the previous attempt.
It seems to work fine with one little twisted exception:
Say that the student attempts the quiz first and that the teacher thereafter edits the quiz and removes or adds a few questions. This will work out fine for as long as the teacher do not get the idea of adding a question with question type RANDOM. The quiz will be fully functional again after removing that RANDOM question or resetting the option 'Each attempt builds on the last" to NO.
Not a very serious problem but it takes someone with greater insight in question type RANDOM to resolve it.
As always, I can not commit lang/en/quiz.php.
The code for reviewing an existing attempt is now separate
in review.php and now has a log entry of it's own.
The overview and regrade reports are now in separate subdirectories
under the "report" directory. Each has a primary "report.php" file
which implements the report as a class.
These existing reports are very simple, but now more complex ones
can easily be written. (I am about to do one).
created. Works OK after limited testing.
I've also renamed some strings to do with "Random Match", so that this
question type is now called "Random Short-Answer Match".
Later there will be a new 'Random Match' which randomly selects one of the
existing "Match" questions.
