In PHP 8.2 and later, setting a value to an undeclared class property is
deprecated and emits a deprecation notice.
So we need to add missing class properties that still need to be declared.
In the quiz reports, for any 'Never submitted' attempt, there is
now a 'Re-open' button next to where it says the attempt state.
If that is clicked, there is an 'Are you sure?' pop-up. If the user
continues, the attempt is reopened. If the student now has time left,
the attempt is put into the In progress state. If there is not time
left the attempt is immediately submitted and graded. The
'Are you sure? pop-up says which of those two things will happen.
This allows an availability plugin to indicate that a selected condition
should be considered "private", and therefore should never be shown to
users who don't satisfy the criteria. The availability_groups plugin
uses this to protect visibility of groups that are not visible to
non-members.
These new settings are designed to enchance user privacy surrounding
groups. They allow groups to be configured so that users outside the
group cannot see the group, so that users in the group cannot see each
other, or so that users cannot see the group at all, even if they are in
it. This avoids issues where a group may be assigned based on sensitive
personal information (such as a person requiring special arrangements
due to a disability).
By default, groups are visible to all and available for participation in
activities, which maintains the current behaviour.
For performance, a new cache has been added to track the number of
groups on a course that are not visible to non-members. This allows us
to revert to the existing behaviour if the new features are not being
used at all on a course, and only apply the new visibility conditions if
they are.
Users who have the moodle/course:viewhiddengroups capability should be
concious of exposing hidden groups when showing their screen to other
users. The "Switch role to..." feature can be used to show a course page
on screen without exposing private availability conditions, for example.
The changes cover several specific areas:
* grouplib functions, which most code should use to get lists of groups
and members (this includes the participants page).
* Activities supporting group overrides will not allow overrides for
groups that are hidden from all users.
* Activities supporting separate/visible groups modes will only allow
groups with the new "participation" flag enabled to be selected.
* Group messaging will be disabled for groups where members cannot see
each other, or cannot see the group at all.
The previous behaviour guessed the table filterset based on the table's
class name, but this is not very flexible if you wish to create an
abstract table class and use a generic filter for all implementations.
This change adds the ability to specify the filterset class, with the
default behaviour using the table class name as a prefix.
