Apart from custom ordering the bookmarks in the places panel, there should be a mechanism to make bookmarks in a hierarchical way.

e.g. (these are bookmarks) -- 

docs (point to /home/Edward/documents)
------Official (points to /home/Edward/documents/official)
------Old (points to /home/Edward/documents/old)

These are supposed to make the user navigate faster and seek to the directory faster cause of the indentation.

To add such a hierarchical bookmark, a user needs to right click on the top most entry (assume it as x) of the bookmark and click on 'add sub-bookmark' (e.g.) after which he'll be asked for the directory using the select dialog.

Reproducible: Always