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, 10 insertions, 0 deletions

diff --git a/lib/gitlab/diff/file.rb b/lib/gitlab/diff/file.rb
index c9d89d56884..88340f044c0 100644
--- a/lib/gitlab/diff/file.rb
+++ b/lib/gitlab/diff/file.rb
@@ -329,6 +329,16 @@ module Gitlab
         lines
       end
 
+      def fully_expanded?
+        return true if binary?
+
+        lines = diff_lines_for_serializer
+
+        return true if lines.nil?
+
+        lines.none? { |line| line.type.to_s == 'match' }
+      end
+
       private
 
       def total_blob_lines(blob)