Problem moving nested folder to Recycle Bin

Create a nested directory temp\sub. Open the parent of temp in the left pane, temp\sub in the right pane. Try to delete temp in the left pane. Get an error:

Command 'MoveToTrash' raised error.

Traceback (most recent call last):
  File "fman\impl\plugins\plugin.py", line 270, in _run_in_thread
  File "C:\Users\Michael\dev\fman\target\fman\Versions\0.7.0\Plugins\Core\core\commands.py", line 117, in __call__
    move_to_trash(url)
  File "fman\fs.py", line 25, in move_to_trash
  File "fman\impl\plugins\mother_fs.py", line 93, in move_to_trash
  File "C:\Users\Michael\dev\fman\target\fman\Versions\0.7.0\Plugins\Core\core\fs\local.py", line 51, in move_to_trash
    move_to_trash(path)
  File "C:\Users\Michael\dev\fman\target\fman\Versions\0.7.0\Plugins\Core\core\trash.py", line 13, in move_to_trash
    send2trash(file)
  File "C:\Users\Michael\dev\fman\target\fman\Versions\0.7.0\Plugins\Core\send2trash\plat_win.py", line 58, in send2trash
    raise OSError(msg)
OSError: Couldn't perform operation. Error code: 120

Reproduce the Windows case with temp\sub open in the opposite pane, then trace MoveToTrash through fman/fs.py, mother_fs.py, core/fs/local.py, core/trash.py, and send2trash/plat_win.py. Done means deleting the parent directory moves it to the Recycle Bin without the reported error code 120.