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
return ((IClassFileEditorInput)input).getClassFile();
		else if (input instanceof IFileEditorInput)
			return ((IFileEditorInput)input).getFile();
		else if (input instanceof JarEntryEditorInput)
			return ((JarEntryEditorInput)input).getStorage();
		return null;
	}
	
	/**
 	 * Returns the Viewer.
 	 */
	TreeViewer getViewer() {
		return fViewer;
	}
	
	/**
 	 * Returns the TreeViewer.
 	 */
	public TreeViewer getTreeViewer() {
		return fViewer;
	}
	
	boolean isExpandable(Object element) {
		if (fViewer == null)
			return false;
		return fViewer.isExpandable(element);
	}
	void setWorkingSetName(String workingSetName) {
		fWorkingSetName= workingSetName;
	}