When adding a bookmark you can see in the bookmarks pane something like this:

-Project
--- FileName.ext
------ FileName.ext Line LineNumber

When you rename you get the same structure with the string given at the end like this:

-Project
--- FileName.ext
------ FileName.ext Line LineNumber "Rename String"

My suggesting is to allow the user to remove the redundant Filanem.ext from the list. So when I rename a bookmark it should be like this:

-Project
--- FileName.ext
------ "Rename String" Line LineNumber

If I rename a bookmark from a file I don't need to know the name of the file. That is in the parent node.

Thanks