[buddypress-trac] [BuddyPress Trac] #8089: Improve Groups activity action formatting

[buddypress-trac]

#8089: Improve Groups activity action formatting
-------------------------+-----------------------
 Reporter:  imath        |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  5.0.0
Component:  Groups       |    Version:
 Severity:  normal       |   Keywords:  has-patch
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 - Introduce a function to try to get the current group if the activity is
 displayed into its activity page before requesting the group thanks to the
 activity's `item_id`.
 - Introduce a new Activity type for activities posted within Groups to
 make sure Group activites are using this type's format callback (otherwise
 the activities posted within groups have no format callback).
 - Make sure this new activity type does not interfere with the regular
 `activity_update` type within activity stream filters (front-end and back-
 end).
 - Move the `groups_post_update()`  from `src/bp-groups/bp-groups-
 functions.php` to `src/bp-groups/bp-groups-activity.php`.

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Ticket URL: <https://buddypress.trac.wordpress.org/ticket/8089>
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