Several version checks were incorrectly using
restore_controller::info::moodle_release instead of moodle_version as a
version number. This replaces all of those checks with a common pair of
methods to make the checks clearer and more maintainable.
When the two restore forms for searching courses and categories were
converted to core templates in eb9935c9 they lost the named submit
button, which broke searching.
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.
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.
As part of a restore, the session is closed early so it does not
interrupt the users session during the restore.
Currently the restore controller rebuilds the course caches while
restoring. This inadvertently resets the navcache, which would edit the
session despite it being closed.
Because this tracker now adds logging for this behaviour, it means
restoring now outputs a debugging message as a warning.
To resolve the debugging message, the navcache is now reset just before
closing the session. This is allowed, since the caches are designed
to be volatile.
Old-version backups (< 3.11.7, < 4.0.1) lose their course-level format
options when restoring into newer versions after the backup structure
was changed.
Also, course-level format options were not accurately restored against
the appropriate format type. And section-level format options were
redundantly stored at course-level and restored without mapping their
sectionids, thus creating lint.
