Take the next type into consideration

app/helpers/commits_helper.rb

@@ -25,8 +25,8 @@ module CommitsHelper
 
   def side_diff_line(diff, index)
     Gitlab::DiffParser.new(diff.diff.lines.to_a, diff.new_path)
-      .each do |full_line, type, line_code, line_new, line_old, raw_line, next_line|
-        yield(full_line, type, line_code, line_new, line_old, raw_line, next_line)
+      .each do |full_line, type, line_code, line_new, line_old, raw_line, next_type, next_line|
+        yield(full_line, type, line_code, line_new, line_old, raw_line, next_type, next_line)
       end
   end
 

app/views/projects/commits/_parallel_view.html.haml

 / Side-by-side diff view
 %div.text-file
   %table
-    - side_diff_line(diff, index) do |line, type, line_code, line_new, line_old, raw_line, next_line|
+    - side_diff_line(diff, index) do |line, type, line_code, line_new, line_old, raw_line, next_type, next_line|
       %tr.line_holder.parallel{ id: line_code }
         - if type == "match"
           = render "projects/commits/diffs/match_line_parallel", {line: line,
@@ -25,7 +25,8 @@
             %td.new_line{class: "#{type}", data: {linenumber: line_new}}
               = link_to raw(line_new) , "##{line_code}", id: line_code
               - if type == 'old'
-                %td.line_content.parallel{class: "noteable_line new #{line_code}", "line_code" => line_code}= raw next_line
+                - content = next_type == 'new' ? next_line :  " "
+                %td.line_content.parallel{class: "noteable_line new #{line_code}", "line_code" => line_code}= raw content
               - else
                 %td.line_content.parallel{class: "#{type}"}= raw line
 

lib/gitlab/diff_parser.rb

@@ -38,8 +38,9 @@ module Gitlab
           next
         else
           type = identification_type(line)
+          next_type = identification_type(next_line)
           line_code = generate_line_code(new_path, line_new, line_old)
-          yield(full_line, type, line_code, line_new, line_old, raw_line, next_line)
+          yield(full_line, type, line_code, line_new, line_old, raw_line, next_type, next_line)
         end