Hi Emacs maintainers,

After some investigation, I noticed that `mm-inline-image' adds a
newline via (insert "\n") directly after `insert-image' for unclear
reasons.

Removing the (insert "\n") form seems to resolve the issue (along with
the other issues mentioned under "Additionally, the following can be
observed") in the initial bug report message.

A patch is included illustrating the change made, but I'm unfamiliar
with the gnus codebase. It would be great if somebody more experienced
took a look.

Cheers,
-A.