How to reproduce it :

• unzip this attachement into the documentary base
• click on the "Jour 1 XSL" folder.
  > on the right panel, it says this folder is empty but it is wrong, this folder does not contains files but it contains folders with various files inside.

Expected behavior :

• in the right panel, we should see that there is sub folders. The "+" and "-" of the left side are too inconspicuous. It is not enough. Folders should appears in the right side too