In bug #165070's demonstration video, attachment #199008 [details], you can see that everytime you reopen a document, it creates another entry for it in the recent documents list menu, even if it was already present in that menu.

To reproduce:

1. From your file manager, open a LibreOffice document
2. Close LibreOffice
3. Repeat steps 1 and 2 a couple of times
4. Look at the "Recent Documents" menu in "Current Module Only" mode

Result: the same document is present multiple times in the list.

Instead, it should bump the existing entry up to the top of the recency list, not create a new entry.

This will keep the list's contents more relevant, and allow showing more different files, instead of a visually overloading list filled with duplicates.