Properly highlight lines around '\ No newline at end of file'

lib/gitlab/diff/highlight.rb

@@ -14,7 +14,7 @@ module Gitlab
       def highlight
         @diff_lines.each_with_index do |diff_line, i|
           # ignore highlighting for "match" lines
-          next if diff_line.type == 'match'
+          next if diff_line.type == 'match' || diff_line.type == 'nonewline'
 
           rich_line = highlight_line(diff_line, i)
 
@@ -33,7 +33,7 @@ module Gitlab
       def highlight_line(diff_line, index)
         return html_escape(diff_line.text) unless diff_file.diff_refs
 
-        line_prefix = diff_line.text.match(/\A([+-])/) ? $1 : ' '
+        line_prefix = diff_line.text.match(/\A(.)/) ? $1 : ' '
 
         case diff_line.type
         when 'new', nil

lib/gitlab/diff/parallel_diff.rb

@@ -62,7 +62,7 @@ module Gitlab
                 }
               }
               skip_next = true
-            when 'old', nil
+            when 'old', 'nonewline', nil
               # Left side has text removed, right side doesn't have any change
               # No next line code, no new line number, no new line text
               lines << {

lib/gitlab/diff/parser.rb

@@ -26,6 +26,10 @@ module Gitlab
             lines_obj << Gitlab::Diff::Line.new(full_line, type, line_obj_index, line_old, line_new)
             line_obj_index += 1
             next
+          elsif line[0] == '\\'
+            type = 'nonewline'
+            lines_obj << Gitlab::Diff::Line.new(full_line, type, line_obj_index, line_old, line_new)
+            line_obj_index += 1
           else
             type = identification_type(line)
             lines_obj << Gitlab::Diff::Line.new(full_line, type, line_obj_index, line_old, line_new)
@@ -33,10 +37,13 @@ module Gitlab
           end
 
 
-          if line[0] == "+"
+          case line[0]
+          when "+"
             line_new += 1
-          elsif line[0] == "-"
+          when "-"
             line_old += 1
+          when "\\"
+            # No increment
           else
             line_new += 1
             line_old += 1
@@ -59,9 +66,10 @@ module Gitlab
       end
 
       def identification_type(line)
-        if line[0] == "+"
+        case line[0]
+        when "+"
           "new"
-        elsif line[0] == "-"
+        when "-"
           "old"
         else
           nil