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/PropertySheetPage.java
menuMgr.add(defaultsAction);
		Menu menu = menuMgr.createContextMenu(viewer.getControl());
		viewer.getControl().setMenu(menu);
		 
		viewer.getControl().addHelpListener(new HelpListener() {
			/*
			 * @see HelpListener#helpRequested(HelpEvent)
			 */
			public void helpRequested(HelpEvent e) {
				
				IStructuredSelection selection = (IStructuredSelection)viewer.getSelection();
				if (!selection.isEmpty()) {
					IPropertySheetEntry entry = (IPropertySheetEntry)selection.getFirstElement();
					Object helpContextId = entry.getHelpContextIds();
					if (helpContextId != null) {
						if (helpContextId instanceof String) {
							WorkbenchHelp.displayHelp((String)helpContextId);
							return;
						}
						
						
						
						 
						
						Object[] contexts = null;
						if (helpContextId instanceof IContextComputer) {
							
							contexts = ((IContextComputer)helpContextId).getLocalContexts(e);
						} else {
							contexts = (Object[])helpContextId;