Introduce `$post_type` param for `count_user_posts()`.

Props Caspie, engelen, DrewAPicture.
Fixes #21364.
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Pass query object to 'the_post' filter.

Props tlovett1.
Fixes #30327.
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Twenty Fifteen: unfix the sidebar if we have a menu with submenus as there is a chance visitors might not be able to scroll down to see submenus in some situations.

Props mattwiebe, fixes #30208.


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