Affix the audio view toolbar to the bottom as opposed to the top of the view. Otherwise it's not accessible when the view is the first item in the content. Said views keep a newline underneath, so there's space for it to appear there instead. fixes #27548, see #27320.

Built from https://develop.svn.wordpress.org/trunk@27792


git-svn-id: http://core.svn.wordpress.org/trunk@27628 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove `tracknumbers` from the UI, can still be overridden as a playlist shortcode attribute.

See #27535.


Built from https://develop.svn.wordpress.org/trunk@27793


git-svn-id: http://core.svn.wordpress.org/trunk@27629 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `multi_resize()` image editor methods, assert that `null` can only be passed for one of the arguments, not both. Add a lot more unit test assertions to ensure this.

Props pbearne, DH-Shredder.
Fixes #26823.


Built from https://develop.svn.wordpress.org/trunk@27794


git-svn-id: http://core.svn.wordpress.org/trunk@27630 1a063a9b-81f0-0310-95a4-ce76da25c4cd