getRecentEdits SELECT ... m.content AS new_content returned the message's
ORIGINAL content (never updated on edit) instead of the post-edit content.
messages.content stores the original body; the current/last-edited body lives
in messages.edited_content. So before===after in the Message Edits diff.
Fix: COALESCE(m.edited_content, m.content) AS new_content so 'After' shows the
edited text and diffs against the captured before-content are meaningful.
asepharyana
5196cb0221