pmail-edit inherent problem

[Richard M Stallman]

pmail-edit operates by unswapping, then narrowing to just the one
message in the whole-file buffer.

This works ok when the message does not require decoding.  But if the
message body is encoded in base64, this will give you the base64 text
to edit -- not very useful.

The only solution I can envision is to let people edit
the viewing buffers.  This would necessitate re-encoding
the edited contents and copying them into the whole-file buffer.

Does anyone see a problem in this, or have another suggestion?