Bug 81877 Package explorer forgets active working set [package explorer]
3.1 M4 1. open pkg explorer. 2. select a working set, pkg explorer updates and filters out projects. 3. close pkg explorer. 4. open package explorer again and the working set is no longer applied. This used to work.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/PackageExplorerPart.java
if (o instanceof IResource)
					return true;
				if ((o instanceof IAdaptable) && ((IAdaptable)o).getAdapter(IResource.class) != null)
					return true;
				}
		}
		return false;
	}
	
	public void selectAndReveal(Object element) {
		selectReveal(new StructuredSelection(element));
	}
	
	boolean isLinkingEnabled() {
		return fLinkingEnabled;
	}
	
	/**
	 * Initializes the linking enabled setting from the preference store.
	 */
	private void initLinkingEnabled() {
		fLinkingEnabled= PreferenceConstants.getPreferenceStore().getBoolean(PreferenceConstants.LINK_PACKAGES_TO_EDITOR);
	}
	/**
	 * Links to editor (if option enabled)
	 */
	private void linkToEditor(IStructuredSelection selection) {
		
		
		if (!isActivePart())