Recent activity is showing activities which were
updated since user last logged in and first modification
done on the activity. So ensure update happens at different
time than activity created.
Makes it possible to add a grouping condition when creating an
activity, using the Behat field type API. You can set the field
using a syntax 'Grouping: NAME' (at present, only groupings are
supported, obviously we could potentially extend this to add
support for other conditions if needed).
Tested in Firefox and Chrome in JS mode, and in non-JS mode.