Manually delete fixture in `test_mysqli_flush_sync()`.

This test creates a dummy post and subsequently runs a query containing
`DROP PROCEDURE`. This latter query implies a `COMMIT`, which means that the
post is not cleaned up for later tests. Manually deleting the post with
`wp_delete_post()` solves this problem.

Fixes #28155.

git-svn-id: https://develop.svn.wordpress.org/trunk@30320 602fd350-edb4-49c9-b593-d223f7449a82
Twenty Fifteen: reduce the margins on the editor body in esitor-style.css. Fixes #30331.

git-svn-id: https://develop.svn.wordpress.org/trunk@30321 602fd350-edb4-49c9-b593-d223f7449a82
Introduce `$post_type` param for `count_user_posts()`.

Props Caspie, engelen, DrewAPicture.
Fixes #21364.

git-svn-id: https://develop.svn.wordpress.org/trunk@30322 602fd350-edb4-49c9-b593-d223f7449a82
Pass query object to 'the_post' filter.

Props tlovett1.
Fixes #30327.

git-svn-id: https://develop.svn.wordpress.org/trunk@30323 602fd350-edb4-49c9-b593-d223f7449a82
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.



git-svn-id: https://develop.svn.wordpress.org/trunk@30324 602fd350-edb4-49c9-b593-d223f7449a82
Twenty Fifteen: cleaning up JS introduced in r30305 that doesn't pass jshint.

Props boonebgorges, fixes #29988.



git-svn-id: https://develop.svn.wordpress.org/trunk@30325 602fd350-edb4-49c9-b593-d223f7449a82