id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
16152	category__in now shows posts from children categories too	linuxologos		"Until 3.0.4 category_in parameter of query_posts() does not show posts from any children of the categories given to it, as currently stated in the [http://codex.wordpress.org/Function_Reference/query_posts#Category_Parameters codex] too. In 3.1-RC2 it does show posts from child-categories.

Let's say we have a category with some subcategories. Posts are assigned either to parent category '''or''' to children of the category (not both to parent and child). If we use 

{{{
query_posts( array( 'category__in' => array($parent_category_id) ) )
}}}

in 3.0.4 only posts assigned to parent category are shown.
But in 3.1 posts from parent as well as subcategories are shown with the same code.

I'm not sure if it is a bug or just the way the parameter will work since 3.1, but people using this parameter that way will possibly see their sites working unexpectedly after upgrading to 3.1.
"	defect (bug)	closed	normal	3.1	Query	3.1	normal	fixed	has-patch commit