This test checks the handling of duplicate destination in the bookmarks tree. There was a bug earlier (#37993) which made two bookmarks pointing to the same destination impossible.

Chapter 1

Nested Chapter 1

Again Chapter 1

Chapter 2

Chapter 1 Blah blah bla. Chapter 2 Blah blah bla. Section 1 Blah blah bla. Section 2 Blah blah bla.