Merge branch '7038-create-issue-regression' into 'master'

CE-Port of gitlab-ee!6708

Closes gitlab-ee#7038

See merge request gitlab-org/gitlab-ce!20917

app/serializers/merge_request_widget_entity.rb

@@ -132,6 +132,10 @@ class MergeRequestWidgetEntity < IssuableEntity
       can?(request.current_user, :create_note, merge_request)
     end
 
+    expose :can_create_issue do |merge_request|
+      can?(current_user, :create_issue, merge_request.project)
+    end
+
     expose :can_update do |merge_request|
       can?(request.current_user, :update_merge_request, merge_request)
     end

spec/fixtures/api/schemas/entities/merge_request_widget.json

@@ -81,6 +81,7 @@
         "can_revert_on_current_merge_request": { "type": ["boolean", "null"] },
         "can_cherry_pick_on_current_merge_request": { "type": ["boolean", "null"] },
         "can_create_note": { "type": "boolean" },
+        "can_create_issue": { "type": "boolean" },
         "can_update": { "type": "boolean" }
       },
       "additionalProperties": false