Merge branch 'indentation-bug' into 'master'

Preserve white space



See merge request !3602

app/assets/stylesheets/pages/diff.scss

@@ -63,10 +63,10 @@
       .line_holder td {
         line-height: $code_line_height;
         font-size: $code_font_size;
-      }
 
-      td {
-        white-space: nowrap;
+        span {
+          white-space: pre;
+        }
       }
     }