What I started with:

Someone pasted text out of a Google doc onto office.wiki. The result was this:

Paragraph one.

Paragraph two.


==Section heading ==
Paragraph three.

The presence of two blank lines before the section heading makes an larger amount of white space, so I removed one (1) extra line in VisualEditor by pressing the delete (backspace) key one time. It looked correct on screen, but the resulting diff had removed both of the blank lines:

Paragraph one.

Paragraph two.
==Section heading ==
Paragraph three.

Staff can see the diff at https://office.wikimedia.org/w/index.php?diff=128380&oldid=128372

(This is sort of the opposite of T54798.)