This is not meant for integration, but for illustration of D8114.
The old format() method would be removedUnlike previously, as would probably the entire
BPF plugin interface as we don't need to re-implement process() for the
highlighting plugin.this now also handles diffs that have text/plain as mimetype, This however shows how a plugin would implement both
if neededand by using the standard attachment container you can also easily save the attachment.