[Plugin: Category Cloud Widget] Code snippet that makes plugin count sub-categories posts as well

if ( function_exists('get_categories') )
{
// new version of wp (2.1+)
$cats = get_categories("style=cloud&show_count=1&use_desc_for_title=0$exclude&hierarchical=0$hide_empty");
foreach ($cats as $cat)
{
// Get current category's children
$children = get_categories('show_count=1&child_of='.$cat->cat_ID);
$child_count = 0;

if ($children != '') {
foreach ($children as $child)
{
// Count the childrens post and add to total sum
$child_count = $child_count + $child->category_count;
}
}
$catlink = get_category_link( $cat->cat_ID );
$catname = $cat->cat_name;
$count = $cat->category_count;
// Sum of count and all childrens counts
$count = $count + $child_count;
if ($count >= $options['min'])
{
$counts{$catname} = $count;
$catlinks{$catname} = $catlink;
}
}
}

https://www.ads-software.com/extend/plugins/widget-category-cloud/