This files describes API changes in /group/*,
information provided here is intended especially for developers.

=== 4.2.1 ===
* The following external methods now return group names correctly formatted:
  - `core_group_get_groups`
  - `core_group_get_course_groups`
  - `core_group_get_course_user_groups`
  - `core_group_get_activity_allowed_groups`
* groups_get_members_join() now includes visibility checks for group memberships.
* \core_group\visibility::sql_member_visibility_where() no longer prefixes the returned WHERE statement with AND, to
  give the calling code greater flexibility about how to use it.

=== 4.2 ===
* `\core_group\visibility` class added to support new `visibility` field in group records. This holds the visibility constants
  and helper functions for applying visibility restrictions when querying groups or group members in the database.
* Changes to the group form to support visibility features:
  - New `visibility` field.
  - New `participation` field.
  - `participation` and `enablemessaging` fields are disabled (default: false) when `visibility` is set
    to `visibility::OWN` or `visibility::NONE`.
* The following externallib functions now accept `visibility` and `participation` as optional parameters:
  - create_groups()
  - update_groups()
* The following externallib functions now also return `visibility` and `participation` fields in their responses:
  - create_groups()
  - get_groups()
  - get_course_groups()

=== 3.11 ===

* The groups do not support 'hidepicture' any more, and so the column 'hidepicture'
  from the table {groups} has be dropped.