Merge branch 'fix-events-api' into 'master'

Fix events order in users/:id/events endpoint

## What does this MR do?

Order of events in contributions API is currently being lost, though docs are saying:

> Get the contribution events for the specified user, sorted **from newest to oldest**.

Order becomes different after `.merge(ProjectsFinder.new.execute(current_user))` call, so I moved ordering below this line.

This MR also removes extra `.page(params[:page])` call in the method chain, since [`paginate(events)` already does it](https://gitlab.com/airat/gitlab-ce/blob/master/lib/api/helpers.rb#L112).

See merge request !7039

lib/api/users.rb

@@ -333,11 +333,11 @@ module API
         user = User.find_by(id: declared(params).id)
         not_found!('User') unless user
 
-        events = user.recent_events.
+        events = user.events.
           merge(ProjectsFinder.new.execute(current_user)).
           references(:project).
           with_associations.
-          page(params[:page])
+          recent
 
         present paginate(events), with: Entities::Event
       end

spec/requests/api/users_spec.rb

@@ -958,6 +958,29 @@ describe API::API, api: true  do
           expect(joined_event['author']['name']).to eq(user.name)
         end
       end
+
+      context 'when there are multiple events from different projects' do
+        let(:second_note) { create(:note_on_issue, project: create(:empty_project)) }
+        let(:third_note) { create(:note_on_issue, project: project) }
+
+        before do
+          second_note.project.add_user(user, :developer)
+
+          [second_note, third_note].each do |note|
+            EventCreateService.new.leave_note(note, user)
+          end
+        end
+
+        it 'returns events in the correct order (from newest to oldest)' do
+          get api("/users/#{user.id}/events", user)
+
+          comment_events = json_response.select { |e| e['action_name'] == 'commented on' }
+
+          expect(comment_events[0]['target_id']).to eq(third_note.id)
+          expect(comment_events[1]['target_id']).to eq(second_note.id)
+          expect(comment_events[2]['target_id']).to eq(note.id)
+        end
+      end
     end
 
     it 'returns a 404 error if not found' do