Fixed expand full file button showing on images

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/59695

app/serializers/diff_file_entity.rb

@@ -57,7 +57,7 @@ class DiffFileEntity < DiffFileBaseEntity
     diff_file.diff_lines_for_serializer
   end
 
-  expose :is_fully_expanded, if: -> (diff_file, _) { diff_file.text? } do |diff_file|
+  expose :is_fully_expanded do |diff_file|
     diff_file.fully_expanded?
   end
 

changelogs/unreleased/fix-expand-full-file-on-image.yml

+---
+title: Fixed expand full file button showing on images
+merge_request:
+author:
+type: fixed