Warn if not empty

[jadO]

Sometimes a folder appears to be empty while it is in fact not. For example: In thumbnail mode a folder shows 4 icons of its content. But it does not show these icons if the folder contains subfolders. So it is easy to delete a folder full of files/subfolders easily.

Solution would be to implement a check if a folder is not empty and in that case to add a line of warning to the popup message that is already there, asking if I really want to delete the item.