Bug 190360 [pde viz] Nodes appear on top of one another
When the pde view is opened the nodes appear on top of one another.
bundles/org.eclipse.ui.navigator.resources/src/org/eclipse/ui/internal/navigator/resources/actions/PasteAction.java
Assert.isNotNull(shell);
        Assert.isNotNull(clipboard);
        this.shell = shell;
        this.clipboard = clipboard;
        setToolTipText("Paste ToolTip"); 
        setId(PasteAction.ID);
        PlatformUI.getWorkbench().getHelpSystem().setHelp(this, "HelpId"); 
				
    }
    /**
     * Returns the actual target of the paste action. Returns null
     * if no valid target is selected.
     * 
     * @return the actual target of the paste action
     */
    private IResource getTarget() {
        List selectedResources = getSelectedResources();
        for (int i = 0; i < selectedResources.size(); i++) {
            IResource resource = (IResource) selectedResources.get(i);
            if (resource instanceof IProject && !((IProject) resource).isOpen()) {
				return null;
			}
            if (resource.getType() == IResource.FILE) {
				resource = resource.getParent();
			}
            if (resource != null) {
				return resource;
			}
        }
        return null;