Bug 49121 Link with Editor does not reveal selection if unchanged
build I20031218 - open a CU - in package explorer, toggle Link with Editor on - it shows the selection - scroll the selection out of view - toggle Link with Editor off then back on - the selection is not shown
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/PackageExplorerPart.java
object = filter(object, parent, filters);
					if (object != null) {
						list.add(object);
					}
				} else
					list.add(object);
			}
			return list.toArray();
		}
		/*
		 * @see AbstractTreeViewer#isExpandable(java.lang.Object)
		 */
		public boolean isExpandable(Object parent) {
			if (isFlatLayout())
				return super.isExpandable(parent);
			
			ViewerFilter[] filters= fViewer.getFilters();
			Object[] children= ((ITreeContentProvider) fViewer.getContentProvider()).getChildren(parent);
			for (int i = 0; i < children.length; i++) {
				Object object= children[i];
				
				if (isEssential(object))
					return true;
				
				object= filter(object, parent, filters);
				if (object != null)
					return true;
			}
			return false;
		}