Advanced links to files can not be copied within a page.

To Reproduce:

1. Insert Link > Advanced
2. Enter file://test.com/test.txt
3. Click insert
4. Mark link with mouse and copy to clipboard
5. Insert the copied link into the next paragraph
6. Click the copied link: the edit menu does not appear
7. Start preview and hover the copied link: it is broken

Works fine with normal "http://" links.