Add some missing CSS prefixes. props `grunt autoprefixer:core`.
Built from https://develop.svn.wordpress.org/trunk@27790


git-svn-id: http://core.svn.wordpress.org/trunk@27626 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Set the default font family to inherit (Open Sans) in all TinyMCE modals, change the cursor to pointer when hovering over Quicktags buttons. Props avryl, see #27279
Built from https://develop.svn.wordpress.org/trunk@27791


git-svn-id: http://core.svn.wordpress.org/trunk@27627 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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
When labeling `Show Tracklist` for playlist settings, use `Show Video List` when the playlist is video.

Fixes #27535.


Built from https://develop.svn.wordpress.org/trunk@27796


git-svn-id: http://core.svn.wordpress.org/trunk@27631 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Edit Image modal:
- Bring back some of the advanced settings.
- Make the layout two-column for wider screens, remove the sidebar, and shrink the modal a bit.
- The image reflects the size as inserted in the post as long as it doesn't overflow the column and is not too tall. Changing the size to another intermediate will also update the image "preview."
- Rename "Edit Image" to "Edit Original" to try and better communicate that editing the image will modify the media library item not just the image inserted into the post that is being edited.
(updates two PNGs from precommit)
Props gcorne, see #27366
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git-svn-id: http://core.svn.wordpress.org/trunk@27632 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Widget Customizer: Improve behavior of bigger widgets.

* Support widgets which are higher than browsers viewport.
* Use widgets width as max-width.
* Don't animate the width of wide widgets to make them visible, instead fade them in/out.
* Fix Chrome flickerings while updating wide widgets.

props adamsilverstein, westonruter, ocean90.
see #27348.
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git-svn-id: http://core.svn.wordpress.org/trunk@27633 1a063a9b-81f0-0310-95a4-ce76da25c4cd