Add indication for closed or merged issuables in GFMadam-finish-5993-closed-issuable

Example: for issues that are closed, the links will now show '[closed]'
following the issue number. This is done as post-process after the markdown has
been loaded from the cache as the status of the issue may change between
the cache being populated and the content being displayed.

In order to avoid N+1 queries problem when rendering notes ObjectRenderer
populates the cache of referenced issuables for all notes at once,
before the post processing phase.

As a part of this change, the Banzai BaseParser#grouped_objects_for_nodes
method has been refactored to return a Hash utilising the node itself as the
key, since this was a common pattern of usage for this method.

1 files changed, 4 insertions, 0 deletions

diff --git a/spec/factories/merge_requests.rb b/spec/factories/merge_requests.rb
index e36fe326e1c..361f9dac191 100644
--- a/spec/factories/merge_requests.rb
+++ b/spec/factories/merge_requests.rb
@@ -44,6 +44,10 @@ FactoryGirl.define do
       state :reopened
     end
 
+    trait :locked do
+      state :locked
+    end
+
     trait :simple do
       source_branch "feature"
       target_branch "master"