Emacs outline fails to preserve the final blank line after headings
when moving subtrees up or down when the outline-blank-line variable
is set to non-nil.

Attached is a patch that resolves the issue.

Steps to Reproduce:
- Set outline-blank-line to a non-nil value (e.g., t).
- Create an outline with multiple subtrees, ensuring a blank line
between them.
- Move an outline subtree up or down using the appropriate command (M-UP 
or M-DOWN).
- Observe that the moved subtree may not include the final blank line.

Expected Behavior: When moving outline subtrees up or down, Emacs should 
respect the outline-blank-line variable and ensure that the moved 
subtrees retain a blank line.

Actual Behavior: The final blank line is omitted when moving outline 
subtrees, despite outline-blank-line being set to non-nil.

Additional Information: Including a blank line when outline-blank-line 
is non-nil is important to maintain the structure of the document. 
Omitting it could cause subtrees to lose their separation, making the 
outline less readable.

--
James Cherti
GitHub: https://github.com/jamescherti
Website: https://www.jamescherti.com/