Merge branch 'relative-link-filter-ref' into 'master'

Do not look up commit again when it is passed to RelativeLinkFilter

## What does this MR do?

Use `context[:commit]` in RelativeLinkFilter instead of looking up commit using `context[:ref]`.

## Why was this MR needed?

Even though the commit object was already passed, unnecessary I/O is done to retrieve the commit object.

## What are the relevant issue numbers?

Fixes #20026

See merge request !5455

1 files changed, 3 insertions, 3 deletions

diff --git a/lib/banzai/filter/relative_link_filter.rb b/lib/banzai/filter/relative_link_filter.rb
index 46762d401fb..4fa8d05481f 100644
--- a/lib/banzai/filter/relative_link_filter.rb
+++ b/lib/banzai/filter/relative_link_filter.rb
@@ -52,7 +52,7 @@ module Banzai
           relative_url_root,
           context[:project].path_with_namespace,
           uri_type(file_path),
-          ref || context[:project].default_branch,  # if no ref exists, point to the default branch
+          ref,
           file_path
         ].compact.join('/').squeeze('/').chomp('/')
 
@@ -116,7 +116,7 @@ module Banzai
       end
 
       def current_commit
-        @current_commit ||= context[:commit] || ref ? repository.commit(ref) : repository.head_commit
+        @current_commit ||= context[:commit] || repository.commit(ref)
       end
 
       def relative_url_root
@@ -124,7 +124,7 @@ module Banzai
       end
 
       def ref
-        context[:ref]
+        context[:ref] || context[:project].default_branch
       end
 
       def repository