Add CSS classes to parents of the current item in the output of wp_list_cats and wp_list_pages [patch]

[janX]

This is a proposal for changes that result in a better output of wp_list_cats and wp_list_pages.

instead of

<li class="page_item"><a href="http://localhost/wp2/mainpage/" title="Main Page">Main Page</a><ul>
	<li class="page_item"><a href="http://localhost/wp2/mainpage/child-1/" title="Child 1">Child 1</a></li>
	<li class="page_item current_page_item"><a href="http://localhost/wp2/mainpage/child-2/" title="Child 2">Child 2</a></li>
</ul>
</li>

you will get

<li class="page_item current_page_parent"><a href="http://localhost/wp2/mainpage/" title="Main Page">Main Page</a><ul>
	<li class="page_item"><a href="http://localhost/wp2/mainpage/child-1/" title="Child 1">Child 1</a></li>
	<li class="page_item current_page_item"><a href="http://localhost/wp2/mainpage/child-2/" title="Child 2">Child 2</a></li>
</ul>
</li>

as the result of a wp_list_pages(...);

instead of

<li class="cat-item">
	<a href="http://localhost/wp2/categories/category/" title="Category's posts">
		Category 
	</a>
	<ul class='children'>
		<li class="cat-item current-cat">
			<a href="http://localhost/wp2/categories/category/subcategory/" title="Subcategory's posts">
				Subcategory 
			</a>
		</li>
	</ul>
</li>

you will get

<li class="cat-item current-cat-parent">
	<a href="http://localhost/wp2/categories/category/" title="Category's posts">
		Category 
	</a>
	<ul class='children'>
		<li class="cat-item current-cat">
			<a href="http://localhost/wp2/categories/category/subcategory/" title="Subcategory's posts">
				Subcategory 
			</a>
		</li>
	</ul>
</li>

as the result of a wp_list_cats(...);

patch for template-functions-post.php

patch for template-functions-category.php

This ticket seems to have a similar solution:  http://trac.wordpress.org/ticket/2395

the patches are already applied since 2.1 ( http://trac.wordpress.org/changeset/4576)