Bug 86515 [Drag and Drop] Drag and drop (move) for project
Drag and drop (move) for project onto Explorer deletes the project from the file system. But this is not reflected in the workspace. Pressing refresh - provides dialog "location deleted" and remove project from the workspace.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/FileTransferDragAdapter.java
List resources= convertIntoResources(selection);
		return resources.size() == selection.size();
	}
	
	public void dragSetData(DragSourceEvent event){
		List elements= getResources();
		if (elements == null || elements.size() == 0) {
			event.data= null;
			return;
		}
		
		event.data= getResourceLocations(elements);
	}
	private static String[] getResourceLocations(List resources) {
		return Resources.getLocationOSStrings((IResource[]) resources.toArray(new IResource[resources.size()]));
	}
	
	public void dragFinished(DragSourceEvent event) {
		if (!event.doit)
			return;
		
		if (event.detail == DND.DROP_MOVE) {
			
			
		}	
		else if (event.detail == DND.DROP_NONE || event.detail == DND.DROP_TARGET_MOVE) {
			handleRefresh(event);
		}
	}