QDirModel / QFileSystemModel do not move directories on drag&drop operations

Using Drag & Drop on QDirModel / QFileSystemModel doesn't work well on Linux:
The model allows move operations on files and directories. But on directories a move operation doesn't work.

Suggestion: The straight forward implementation on Linux would be to use rename() which is much faster then a copy()/remove() and would not care if it is a file or a directory.