`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
After [29543], the iframe sandboxes for media need to load Open Sans. Playlists look aggressively bad without it. Adds font styles for the body.

See #29048.

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git-svn-id: http://core.svn.wordpress.org/trunk@29338 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: don't auto-select attachments upon upload.

Props ocean90.
See #28842.

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git-svn-id: http://core.svn.wordpress.org/trunk@29339 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: after completing a Bulk action, switch from `select` to `edit` mode.

Fixes #28842.

Built from https://develop.svn.wordpress.org/trunk@29566


git-svn-id: http://core.svn.wordpress.org/trunk@29340 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: don't hide the uploader progress bar for individual items.

See [29527], #29037.

Built from https://develop.svn.wordpress.org/trunk@29567


git-svn-id: http://core.svn.wordpress.org/trunk@29341 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: after [29566], account for Trash and Delete.

See #28842.

Built from https://develop.svn.wordpress.org/trunk@29568


git-svn-id: http://core.svn.wordpress.org/trunk@29342 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Introduce plugin icons in the installer.

See http://wp.me/p2AvED-2P8 for the announcement and how to implement these.

props tellyworth.
see #28785.

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git-svn-id: http://core.svn.wordpress.org/trunk@29343 1a063a9b-81f0-0310-95a4-ce76da25c4cd
TinyMCE: update to 4.1.4. Changelog: http://www.tinymce.com/develop/changelog/?type=tinymce. Fixes #29310
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git-svn-id: http://core.svn.wordpress.org/trunk@29344 1a063a9b-81f0-0310-95a4-ce76da25c4cd
TinyMCE wpView: prevent errors when pasting multiple non-embeddable URLs, props avryl, fixes #29268
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git-svn-id: http://core.svn.wordpress.org/trunk@29345 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Autosave: prevent setting multiple stale `wp-saving-post-*` cookies when the browser disregards "session cookies" expiration on quit:
- Add expiration time of 24 hours for these cookies.
- Rename them to `wp-saving-post` (no post_id) so there is never more than one cookie per domain.
Fixes #29294.
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git-svn-id: http://core.svn.wordpress.org/trunk@29346 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Export: Add wxr_export_skip_commentmeta filter to match the _postmeta filter.

props cfinke.
fixes #28745.

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git-svn-id: http://core.svn.wordpress.org/trunk@29347 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Plugin compatibility warnings should be red, not green.

props avryl.
fixes #29309.
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git-svn-id: http://core.svn.wordpress.org/trunk@29348 1a063a9b-81f0-0310-95a4-ce76da25c4cd