AbstractReferenceFilter caches current project_ref on RequestStore when active

Before we weren’t caching current_project_ref because normally the reference to 
the current project doesn’t include the path with namespace. But now we store 
the current project in the projects reference cache to be used for the same 
filter when accessing using path with namespace of for subsequent filters executed on the cache.

CHANGELOG

@@ -2,6 +2,7 @@ Please view this file on the master branch, on stable branches it's out of date.
 
 v 8.13.0 (unreleased)
   - Use gitlab-shell v3.6.2 (GIT TRACE logging)
+  - AbstractReferenceFilter caches project_refs on RequestStore when active
   - Speed-up group milestones show page
   - Log LDAP lookup errors and don't swallow unrelated exceptions. !6103 (Markus Koller)
   - Add more tests for calendar contribution (ClemMakesApps)

lib/banzai/filter/abstract_reference_filter.rb

@@ -64,7 +64,7 @@ module Banzai
         end
       end
 
-      def project_from_ref_cache(ref)
+      def project_from_ref_cached(ref)
         if RequestStore.active?
           cache = project_refs_cache
 
@@ -146,7 +146,7 @@ module Banzai
       # have `gfm` and `gfm-OBJECT_NAME` class names attached for styling.
       def object_link_filter(text, pattern, link_text: nil)
         references_in(text, pattern) do |match, id, project_ref, matches|
-          project = project_from_ref_cache(project_ref)
+          project = project_from_ref_cached(project_ref)
 
           if project && object = find_object_cached(project, id)
             title = object_link_title(object)
@@ -243,11 +243,27 @@ module Banzai
         end
       end
 
-      # Returns the projects for the given paths.
-      def find_projects_for_paths(paths)
+      def projects_relation_for_paths(paths)
         Project.where_paths_in(paths).includes(:namespace)
       end
 
+      # Returns projects for the given paths.
+      def find_projects_for_paths(paths)
+        if RequestStore.active?
+          to_query = paths - project_refs_cache.keys
+
+          unless to_query.empty?
+            projects_relation_for_paths(to_query).each do |project|
+              get_or_set_cache(project_refs_cache, project.path_with_namespace) { project }
+            end
+          end
+
+          project_refs_cache.slice(*paths).values
+        else
+          projects_relation_for_paths(paths)
+        end
+      end
+
       def current_project_path
         @current_project_path ||= project.path_with_namespace
       end

lib/banzai/filter/issue_reference_filter.rb

@@ -66,7 +66,7 @@ module Banzai
         end
       end
 
-      def find_projects_for_paths(paths)
+      def projects_relation_for_paths(paths)
         super(paths).includes(:gitlab_issue_tracker_service)
       end
     end