Escape ref and path for relative links (!6050)

CHANGELOG.md

@@ -8,6 +8,7 @@ Please view this file on the master branch, on stable branches it's out of date.
   - Fix extra space on Build sidebar on Firefox !7060
   - Fix HipChat notifications rendering (airatshigapov, eisnerd)
   - Add hover to trash icon in notes !7008 (blackst0ne)
+  - Escape ref and path for relative links !6050 (winniehell)
   - Simpler arguments passed to named_route on toggle_award_url helper method
   - Fix: Backup restore doesn't clear cache
   - Use MergeRequestsClosingIssues cache data on Issue#closed_by_merge_requests method

lib/banzai/filter/relative_link_filter.rb

@@ -52,8 +52,8 @@ module Banzai
           relative_url_root,
           context[:project].path_with_namespace,
           uri_type(file_path),
-          ref,
-          file_path
+          Addressable::URI.escape(ref),
+          Addressable::URI.escape(file_path)
         ].compact.join('/').squeeze('/').chomp('/')
 
         uri