At my customer, we created a solution where users can fill in some comments in a SharePoint multiline text-field.
Unfortunately, every time they entered some lines, they appeared a little bit too far from each other.
Looking at the code, SharePoint adds a “p” or double “div”’s around the line.
After some testing, the simple solution became quite obvious: use the Shift-Enter combo (just like in Microsoft Word) to keep the lines close to each other.