Describe the bug

When a user replys to a post on the discussion forum, we send a notification email to users (depending on their notification subscriptions).

Originally this email included a portion of the original post and all of the reply post. Currently that email appears to contain the entire original post as well as all of the reply post. For long initial posts, this means the email is very long.

I believe this behavior change was an unintended change after a refactor of the forum / notification system.

Expected behavior

Let's return to including a small portion of the original post, so that the focus of the email notification is on the text of the reply post.