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
}
		return super.getAdapter(key);
	}
	/**
	 * Returns the tool tip text for the given element.
	 */
	String getToolTipText(Object element) {
		String result;
		if (!(element instanceof IResource)) {
			if (element instanceof IJavaModel) {
				result= PackagesMessages.PackageExplorerPart_workspace; 
			} else if (element instanceof IJavaElement){
				result= JavaElementLabels.getTextLabel(element, AppearanceAwareLabelProvider.DEFAULT_TEXTFLAGS);
			} else if (element instanceof IWorkingSet) {
				result= ((IWorkingSet)element).getName();
			} else if (element instanceof WorkingSetModel) {
				result= PackagesMessages.PackageExplorerPart_workingSetModel; 
			} else {
				result= fLabelProvider.getText(element);
			}
		} else {
			IPath path= ((IResource) element).getFullPath();
			if (path.isRoot()) {
				result= PackagesMessages.PackageExplorer_title; 
			} else {
				result= path.makeRelative().toString();
			}
		}
		
		if (fWorkingSetName == null)