Chrome Version: 58.0.3000.0

Steps To Reproduce:
(1) Open a directory or a volume containing a subdirectory.
(2) Start to drag a subdirectory in the file list.
(3) Drop the subdirectory to itself.
(4) Drag the subdirectory again and keep the mouse cursor on the subdirectory for a while.

Expected Result:
(3) The move operation is cancelled without any error.
(4) Nothing happens.

Actual Result:
(3) Error message appears: "Move failed. The file could not be modified."
(4) The Files app navigates into the subdirectory. (just like when hovering on a directory in other places)


- The same happens when doing above with [ctrl] key down. (i.e. copy by drag-drop)
- The error message might not be easy to understand because it just tells the internal operation was failed without the reason. If we were to make it more descriptive, "You cannot move a directory into itself".
- I think this operation should be treated as a cancellation of the drag gesture, thus should not give any error message.
- Moving a directory into itself or its descendant directory is always impossible. Therefore navigating into the directory and its subdirectory by hovering on it may not be helpful for this case.