Add option to expand diff to full file

The user can also toggle between the diff changes and
the full file diff.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/19054

1 files changed, 5 insertions, 1 deletions

diff --git a/app/serializers/diff_file_entity.rb b/app/serializers/diff_file_entity.rb
index 01ee7af37ed..13711070a46 100644
--- a/app/serializers/diff_file_entity.rb
+++ b/app/serializers/diff_file_entity.rb
@@ -7,7 +7,7 @@ class DiffFileEntity < DiffFileBaseEntity
   expose :added_lines
   expose :removed_lines
 
-  expose :load_collapsed_diff_url, if: -> (diff_file, options) { diff_file.viewer.collapsed? && options[:merge_request] } do |diff_file|
+  expose :load_collapsed_diff_url, if: -> (diff_file, options) { options[:merge_request] } do |diff_file|
     merge_request = options[:merge_request]
     project = merge_request.target_project
 
@@ -57,6 +57,10 @@ class DiffFileEntity < DiffFileBaseEntity
     diff_file.diff_lines_for_serializer
   end
 
+  expose :is_fully_expanded, if: -> (diff_file, _) { Feature.enabled?(:expand_diff_full_file) && diff_file.text? } do |diff_file|
+    diff_file.fully_expanded?
+  end
+
   # Used for parallel diffs
   expose :parallel_diff_lines, using: DiffLineParallelEntity, if: -> (diff_file, _) { diff_file.text? }
 end