In the latest version of WP I see the category.php page is now using edit-tags.php. The version Im running seems to have an issue with the search feature on this page whereas the new version doesnt. When searching for categories, the results show the category search AND its heirarchy i.e. - categoryname together in the same list. Short of doing a major overhaul and upgrade as one does need to check compatibility, what was changed in the new version that I could update in the old version of my source?
example: I have 5 categorys, 3 parents, 2 children. They all have the word cat in their name. If I search for the word 'cat' I not only get the 5 results, but ALSO another three results with - category name for each of the children again. This is not the case in 3.0.5