user reported that sometimes there are duplicated items.

we explained:

1. when i have a structure C:\test\1\2\3\file and i add 'C:\test\1' 'C:\test\1\2' and 'C:\test\1\2\3' as recursive then it might add 'C:\test\1\2\3\file' three times.
   => user does not use settings 'Directories'

2. when using 'Filter menu by file type' this can happen
   
   => user does not use settings 'Filter menu by file type'

3. when using relativ path this can happen
   
   =>...