Bug 27530 [Properties view] CopyPropertyAction does not dispose clipboard
build I20021127 CopyPropertyAction allocates a Clipboard but does not dipose it. Should add a dispose method here, and call it from PropertySheetPage.dispose().
bundles/org.eclipse.ui.views/src/org/eclipse/ui/views/properties/CopyPropertyAction.java
/**
	 * System clipboard
	 */
	private Clipboard clipboard;
	/**
	 * Creates the action.
	 */
	public CopyPropertyAction(PropertySheetViewer viewer, String name) {
		super(viewer, name);
		WorkbenchHelp.setHelp(this, IPropertiesHelpContextIds.COPY_PROPERTY_ACTION);
		clipboard = new Clipboard(Display.getCurrent());
	}
	
	/**
	 * Performs this action.
	 */
	public void run() {
		
		IStructuredSelection selection = (IStructuredSelection)getPropertySheet().getSelection();
		if (selection.isEmpty()) 
			return;