Clicking on a focusable node (e.g. image, template) a second time tries to remove focus from it.
In VE article editing this results in the surface being deactivated and the selection going grey.
In DiscussonTools this results in the selection be removed.
This is also makes it impossible to drag and drop and focusable node while it is already focused.
Clicking a second time should do nothing (unless done quickly as part of a double click).