Page links starting with # (anchor links) will always show as modified between page versions (Highlighted in light blue as "Formatting was changed.")

Steps to reproduce:

1. Create a page
2. write 'text'
3. select it and click on Insert a Link
4. go to Advanced
5. insert the link: #something
6. save page
7. edit page by adding some random text.
8. compare versions by clicking in '(view changes)'

Result: Change is highlighted in green and link is highlighted in blue although it was not changed.
Expected: Only the added text is highlighted in green.