get_adjacent_post excluded_categories isn't excluded

[PatNarciso]

The category I expect to be excluded in $excluded_categories, is not excluded.

With get_adjacent_post,
Assuming $in_same_cat = TRUE
and $excluded_categories = 'ID_OF_CATEGORY'

$cat_array gets built with the ID's of categories it should include. cool.

But, when $excluded_categories contains an ID that $cat_array contains, the ID is removed from the $excluded_categories by array_diff() (link-template.php:1155).

So: the category I expect to be excluded in $excluded_categories, is not excluded.

My resolution: I remove 1154-1157.

if ( ! empty( $cat_array ) ) {
 $excluded_categories = array_diff($excluded_categories, $cat_array);
 $posts_in_ex_cats_sql = '';
}