Use a more specific hook when calling theme('item_list')

It would allow for easier themeing if a more specific hook was used when calling theme('item_list').

For example if it called it like this:

theme('item_list__views_tree', array('items' => $items, 'type' => $options['type']))

Then themers could easily target views tree item lists by overriding the theme_item_list() theme function and naming it like this:

<?php
function THEMENAME_item_list__views_tree($variables) {

}
?>

It could also still be overridden using the more generic

<?php
function THEMENAME_item_list($variables) {

}
?>