FileBrowser[Sheet] display the contents of the root instead of actual folder in some circumstancies

When you open a fresh FileBrowser or FileBrowserSheet, with a no-argument constructor, and then you set the root directory to a directory under another drive than C:, say "T:\FOLDER" for example, then when you open it it seems to be located at the right place (from the above bar) but the actual displayed files are those at the root of the drive. See screen capture for better comprehension.

Seems to appear when :

• the root folder is not specified in the constructor
• the root folder is not under C: (reproduced with network drives and USB keys, couldn't try with another partition or internal drive as I don't have one here)

Steps to reproduce :
1/ map T: to a network drive or plug in a USB key
2/ create the following structure : T:\FOLDER\SUBFOLDER
3/ run the following code :

Window window = new Window();
window.open(display);
window.setMaximized(true);

FileBrowserSheet fileBrowserSheetFile = new FileBrowserSheet(Mode.OPEN);
// The folder structure is T:\FOLDER\SUBFOLDER
fileBrowserSheetFile.setRootDirectory(new File("T:\\FOLDER
"));
fileBrowserSheetFile.open(window);
// Bug : it actually opens on FOLDER but displayed is the content of T: root

Expected : I want to see my "SUBFOLDER" but I actually see "FOLDER".

Remark : If I want to set the root to a more deeply nested folder, like d:\f1\f2\f3, I still see the content of d:

Workaround : use the constructor with the root folder in it, like :
FileBrowserSheet fileBrowserSheetFile = new FileBrowserSheet(Mode.OPEN, "T:
FOLDER");