Sketches can't be organized in sub-folders

[disquisitioner]

My sketches folder doesn't just contain individual sketches, but also contains sub-folders that themselves contain sketches. This lets me organize sketches in groups, e.g. all my LED sketches go in a special sub-folder. However, Electron doesn't allow me to traverse those sub-folders through the navigation bar on the left side of the main page. It shows my top-level sub-folders but if I click on any of them I get an error message ("Error: EISDIR, illegal operation on a directory").