[MDL-28226] LASTATTEMPT quiz not using latest attempt to grade - Moodle Tracker

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Testing Instructions:

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Testing is most needed in 2.0:

1. Create a quiz set to grading method first, or last, attempt.
2. Do lots of attempts as one student.
3. Try to persuade your database to return records in an arbitrary order. I think Postgres does this after you have deleted enough rows from a table and vacuummed.
4. Regrade the quiz, and make sure the final grade is computed correctly.

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Testing is most needed in 2.0: 1. Create a quiz set to grading method first, or last, attempt. 2. Do lots of attempts as one student. 3. Try to persuade your database to return records in an arbitrary order. I think Postgres does this after you have deleted enough rows from a table and vacuummed. 4. Regrade the quiz, and make sure the final grade is computed correctly.
Affected Branches:
MOODLE_20_STABLE, MOODLE_21_STABLE, MOODLE_22_STABLE
Fixed Branches:
MOODLE_20_STABLE, MOODLE_21_STABLE
Pull from Repository:
git://github.com/timhunt/moodle.git
Pull Master Branch:
~~MDL-28226~~
Pull Master Diff URL:
https://github.com/timhunt/moodle/compare/master...MDL-28226

The quiz grade calculation in LASTATTEMPT mode uses the last on the list of attempts it is given, not the last by data.

This is resolved by checking the attempt is newer than the best so far, so latest attempts are used regardless of order.

Patch incoming with github link

is blocked by

MDL-28227 Regrade sometimes grades user attempts for any quiz not selected quiz

Participants:: Adam Olley, Eloy Lafuente (stronk7), Martin Dougiamas, Michael de Raadt, Tim Hunt, Tony Levi

Component watchers:: Tim Hunt, Andrew Nicols, Jun Pataleta, Michael Hawkins, Shamim Rezaie, Simey Lameze