Merge branch 'activity-tabs-single-select' into 'master'

Treats activity tabs as single select

Fixes #8092

![activity-tabs](/uploads/1fb4d9233492252cfd93c74579e97514/activity-tabs.gif)

See merge request !2940

app/assets/javascripts/activities.js.coffee

 class @Activities
   constructor: ->
     Pager.init 20, true
-    $(".event-filter a").bind "click", (event) =>
+    $(".event-filter-link").on "click", (event) =>
       event.preventDefault()
       @toggleFilter($(event.currentTarget))
       @reloadActivities()
@@ -12,18 +12,10 @@ class @Activities
 
 
   toggleFilter: (sender) ->
-    sender.closest('li').toggleClass "active"
+    $('.event-filter .active').removeClass "active"
     event_filters = $.cookie("event_filter")
     filter = sender.attr("id").split("_")[0]
-    if event_filters
-      event_filters = event_filters.split(",")
-    else
-      event_filters = new Array()
+    $.cookie "event_filter", (if event_filters isnt filter then filter else ""), { path: '/' }
 
-    index = event_filters.indexOf(filter)
-    if index is -1
-      event_filters.push filter
-    else
-      event_filters.splice index, 1
-
-    $.cookie "event_filter", event_filters.join(","), { path: '/' }
+    if event_filters isnt filter
+      sender.closest('li').toggleClass "active"

features/dashboard/event_filters.feature

@@ -43,10 +43,16 @@ Feature: Event Filters
     And I should not see new member event
     When I click "team" event filter
     And I visit dashboard activity page
-    Then I should see push event
+    Then I should not see push event
     And I should see new member event
     And I should not see merge request event
     When I click "push" event filter
-    Then I should not see push event
-    And I should see new member event
+    And I visit dashboard activity page
+    Then I should see push event
+    And I should not see new member event
     And I should not see merge request event
+    When I click "merge" event filter
+    And I visit dashboard activity page
+    Then I should see merge request event
+    And I should not see push event
+    And I should not see new member event