Bug 15301 'show in packages view' - does not work fo java files not in source folders
20020502 open a java file that is in a resource folder (so it is not an ICompilationUnit - just a file with .java extension) 'show in packages view' is present in the context menu but it does nothing
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/PackageExplorerPart.java
if ( element.equals(cu))
							return;
					}
					IClassFile cf= (IClassFile)((IJavaElement)o).getAncestor(IJavaElement.CLASS_FILE);
					if (cf != null && element.equals(cf))
						return;
				}
			}
			ISelection newSelection= new StructuredSelection(element);
			if (!fViewer.getSelection().equals(newSelection)) {
				try {
					fViewer.removeSelectionChangedListener(fSelectionListener);
					fViewer.setSelection(newSelection);
				} finally {
					fViewer.addSelectionChangedListener(fSelectionListener);
				}
			}
		}
	}
	
	/**
	 * A compilation unit or class was expanded, expand
	 * the main type.  
	 */
	void expandMainType(Object element) {
		try {
			IType type= null;
			if (element instanceof ICompilationUnit) {
				ICompilationUnit cu= (ICompilationUnit)element;
				IType[] types= cu.getTypes();