Moving a folder into one of it's child folders should not be possible

[cadagong]

Currently, if you select and right-click on a folder and select the "Move" option, you will be shown a tree of potential folder destinations to move the selected folder into. These options include the child folders of the selected folder, which should not be valid destinations. However, when I select that child folder as the destination, the selected folder disappears entirely and it, along with all of its contents, becomes inaccessible.