"Stefan Kangas" <stefankangas@gmail.com> writes:

> S v runs the command gnus-summary-very-wide-reply

That doesn't quite do what I want, since it only works in Summary
buffers, not Article buffers, and doesn't include the original, let
alone allow me to reply only to particular parts of the origina. But I
discovered S W works as wide reply with original in Summary /and/ in
Article buffers (less to remember) /and/ also allows me to reply to
selected parts of the original message in Article buffers, which is
exactly what I wanted.