Overview
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When dragging a section heading from the Navigator, Writer adds the entire
section as a copy instead of adding the hyperlink to the section heading. 

Steps to Reproduce
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- Create a new document.
- Add two headings and some text in a paragraph below each heading.
- Open the Navigator.
- Set the Drag Mode to Hyperlink.
- Drag the second heading from the Navigator's Headings section to the end of
the paragraph below the first heading.

Actual Results
--------------
Writer adds entire section as a copy.

Expected Results
----------------
Writer adds a hyperlink to the section with the section heading as text.