Comment 2 for bug 486168

Also I just discovered, suppose one of the overlapped icons is selected, then it's not possible to navigate to and highlight any other icon on the desktop using the arrow keys up, down, left and right: the selection highligh keeps looping among the overlapped icons.
And yes, more that two partitions icons can overlap; then, only the top two icons can be selected and highlighted: the other icon(s) is/are simply "non-existent": they are present on the desktop but cannot be selected by navigation keys due to the above stated looping among the top two icons and also cannot be selected by the mouse click since the top two icons effectively hide the ones below them.