Align and unify (most) modal and customizer icons. fixes #29147.

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git-svn-id: http://core.svn.wordpress.org/trunk@29318 1a063a9b-81f0-0310-95a4-ce76da25c4cd
TinyMCE wpView sandbox iframes: 
- Make them transparent.
- Don't load tons of unrelated styles that can break them. This could result in minimal styling mismatch to the front-end, but keeps the views working well and looking good.
Props avryl, fixes #29048.
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TinyMCE wpView: add sandbox iframe body styling to get proper height when resizing the iframe, fixes #29270.
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TinyMCE wpView: scale iframes to 100% width and ensure they have transparent background. See #29048.
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TinyMCE wpView: show an error when no items are found while parsing a audio/video/playlist shortcode. Props avryl, fixes #29114.
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git-svn-id: http://core.svn.wordpress.org/trunk@29322 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Library: Set max value of columns to 12.

fixes #29275.
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git-svn-id: http://core.svn.wordpress.org/trunk@29323 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: Don't hide error messages behind the toolbar.

fixes #29141.
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git-svn-id: http://core.svn.wordpress.org/trunk@29324 1a063a9b-81f0-0310-95a4-ce76da25c4cd
`wp_update_term()` should mimic `wp_insert_term()` and set a value for `$term_group` before the `alias_of` logic runs. This ensures that `$term_group` exists when `compact()` is called.

See [28461].
Fixes #29278.

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git-svn-id: http://core.svn.wordpress.org/trunk@29325 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media: Remove scan for lost attachments.

This hasn't been worked for 4 years.

fixes #29169.

Built from https://develop.svn.wordpress.org/trunk@29550


git-svn-id: http://core.svn.wordpress.org/trunk@29326 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: Cleanup toggling of Next/Previous in Edit modal.

Fixes #29264.

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git-svn-id: http://core.svn.wordpress.org/trunk@29327 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Insert Media: Don't select a model if it's already selected.

props avryl, adamsilverstein.
fixes #29152.

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git-svn-id: http://core.svn.wordpress.org/trunk@29328 1a063a9b-81f0-0310-95a4-ce76da25c4cd
`wpmu_activate_signup()` returns an `array` or `WP_Error`. The array keys it returns can be different based on context of `$signup`. The return value was previously `extract()`'d, so the value of `$blog_id` was secretly undefined when being passed to `get_blogaddress_by_id()` in some cases.

If `$result['blog_id']` is not set, make sure `$url` is set to an empty string so that the proper "activated" message is shown to the user.

Props imath.
See [28373].
Fixes #29191.

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git-svn-id: http://core.svn.wordpress.org/trunk@29329 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Initial cleanup after [29220]:

* Alter/remove some jQuery global selectors, views should only manage themselves
* Trigger an event for attachments when arrow keys are pressed: `attachment:keydown:arrow`
* `media.view.Attachments` should listen for `attachment:keydown:arrow`
* Favor scoped selectors over globals

See #23560.

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git-svn-id: http://core.svn.wordpress.org/trunk@29330 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Cleanup after [29220]:

* `media.view.Attachment` should not reach outside itself with global jQuery selectors
* `media.view.Attachment.Details` will re-render when `media.view.Attachment`'s single status changes. Add a `ready` callback to apply initial input focus

See #23560.

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git-svn-id: http://core.svn.wordpress.org/trunk@29331 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Don't limit WP_Embed::cache_oembed() to posts and pages.

props bordoni, helen.
fixes #28639.
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git-svn-id: http://core.svn.wordpress.org/trunk@29332 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Cleanup after [29220]:

`media.controller.Library` is State/Backbone Model and should not touch views.

See #23560.

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git-svn-id: http://core.svn.wordpress.org/trunk@29333 1a063a9b-81f0-0310-95a4-ce76da25c4cd
TinyMCE wpView: add a filter for the stylesheet URLs loaded in the sandbox iframes. See #29048.
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git-svn-id: http://core.svn.wordpress.org/trunk@29334 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid/Modal Keyboard navigation improvements:

* Add focus to arrows on Next/Previous in the grid's modal on left/right keypress, and add the necessary CSS for `:focus`
* When in a disabled input in the grid modal, allow the left/right keys to work
* Make the image editor return a `$.Deferred` so that there isn't a race condition with UI loading. 
* Assign focus when the edit image mode is rendered so that the modal can be closed on Esc press

Props wonderboymusic, adamsilverstein (for the initial patch).
See #23560.

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git-svn-id: http://core.svn.wordpress.org/trunk@29335 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add missing box-shadow for pingbacks in Dashboard Activity widget.

props chrisl27.
fixes #29198.
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git-svn-id: http://core.svn.wordpress.org/trunk@29336 1a063a9b-81f0-0310-95a4-ce76da25c4cd
`media.view.Attachment`: set all of the view attributes in the same hash.

See [29299], #23560.

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git-svn-id: http://core.svn.wordpress.org/trunk@29337 1a063a9b-81f0-0310-95a4-ce76da25c4cd