Bug 81426 Package Explorer shows nothing after drill into working set, then show projects
I200412160800 - switch Package Explorer to working sets - context menu > Go Into a working set - Show > Projects -> view is empty -> view toolbar button 'Up to Working Sets' does not do anything
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/PackageExplorerPart.java
if (revealAndVerify(resource))
		                return true;
		        }
		    }
		}
        return false;
    }
    private Object getVisibleParent(Object object) {
    	
    	if (object == null)
    		return null;
    	if (!(object instanceof IJavaElement))
    	    return object;
    	IJavaElement element2= (IJavaElement) object;
    	switch (element2.getElementType()) {
    		case IJavaElement.IMPORT_DECLARATION:
    		case IJavaElement.PACKAGE_DECLARATION:
    		case IJavaElement.IMPORT_CONTAINER:
    		case IJavaElement.TYPE:
    		case IJavaElement.METHOD:
    		case IJavaElement.FIELD:
    		case IJavaElement.INITIALIZER:
    			
    			element2= (IJavaElement)element2.getOpenable();
    			break;
    		case IJavaElement.JAVA_MODEL:
    			element2= null;
    			break;
    	}
    	if (element2.getElementType() == IJavaElement.COMPILATION_UNIT) {