A simple new view to easily display all activity on a model grouped by res_id and activity_type_id. Some action are possible like sending a mail template for all record having an activity with this activity type and present in the view (depends on the filter). The view use the Kanban activity view on cells. It could be a good idea to rename this widget to something like "DropdownActivityView" (maybe after the freeze) Task: #1870662 PR: #26272