Add smart adaptive completed_at display for action list as intended hidden feature

addon/controllers/action-list.coffee

@@ -7,6 +7,9 @@ export default Ember.Controller.extend
   scope_project: null
   scope_scenario: null
   scope_organization: null
+  show_completed_at: Ember.computed 'filters.state_in.[]', 'filters.completed_at_gteq', 'filters.completed_at_lteq', ->
+    return true if @get('filters.completed_at_lteq') or @get('filters.completed_at_gteq')
+    JSON.stringify(@get('filters.state_in')) is '["completed"]'
   filter_query: Ember.computed 'filters.filter_calls', ->
     @get('filters')?.toProperties() || {}
   export_human_url: Ember.computed 'filter_query', ->

addon/controllers/action-list.js

@@ -9,6 +9,12 @@ export default Ember.Controller.extend({
   scope_project: null,
   scope_scenario: null,
   scope_organization: null,
+  show_completed_at: Ember.computed('filters.state_in.[]', 'filters.completed_at_gteq', 'filters.completed_at_lteq', function() {
+    if (this.get('filters.completed_at_lteq') || this.get('filters.completed_at_gteq')) {
+      return true;
+    }
+    return JSON.stringify(this.get('filters.state_in')) === '["completed"]';
+  }),
   filter_query: Ember.computed('filters.filter_calls', function() {
     var ref;
     return ((ref = this.get('filters')) != null ? ref.toProperties() : void 0) || {};