dnd: Style no-drop icons differently
Add a .no-drop style class to drag icons if there is no selected action, and style the icon to be translucent in that case, to indicate 'no drop'.
Related: #6337
Add a .no-drop style class to drag icons if there is no selected action, and style the icon to be translucent in that case, to indicate 'no drop'.
Related: #6337