XMLRPC: Restore support in wp.newPost for dates to be supplied in the structured dateTime.iso8601 format as well as still supporting dates specified as strings.

Fixes #28601.

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git-svn-id: http://core.svn.wordpress.org/trunk@28849 1a063a9b-81f0-0310-95a4-ce76da25c4cd
is_active_widget() should skip orphaned widgets.

props Ninos Ego.
fixes #28810.
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git-svn-id: http://core.svn.wordpress.org/trunk@28850 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: make the edit attachment icon clickable.

Props ericlewis.
See #24716.

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git-svn-id: http://core.svn.wordpress.org/trunk@28851 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid, remove unnecessary abstraction: `wp.media.controller._State`

Props ericlewis.
See #24716.

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git-svn-id: http://core.svn.wordpress.org/trunk@28852 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid, add padding to "No Media Found" message.

Props michalzuber.
See #24716.

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git-svn-id: http://core.svn.wordpress.org/trunk@28853 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid JS errors after [29057].

See #24716.

Built from https://develop.svn.wordpress.org/trunk@29068


git-svn-id: http://core.svn.wordpress.org/trunk@28854 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid JS errors after [29057].

See #24716.

Built from https://develop.svn.wordpress.org/trunk@29069


git-svn-id: http://core.svn.wordpress.org/trunk@28855 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid JS errors after [29057]. When the modal closes, reset the URL.

See #24716.

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git-svn-id: http://core.svn.wordpress.org/trunk@28856 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid JS errors after [29057]. This is not how `_.debounce()` works.

See #24716.

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git-svn-id: http://core.svn.wordpress.org/trunk@28857 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: `hasNext` and `hasPrevious` are functions that must be called. Otherwise they are always truthy properties.

See #24716.

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git-svn-id: http://core.svn.wordpress.org/trunk@28858 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: make the router work when `?item=` is in the URL on page load. This is still a hack, needs to be event-driven. 
See #24716.

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git-svn-id: http://core.svn.wordpress.org/trunk@28859 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: add disambiguation between generic frames and routers and the router specifically interacting with the grid's frame.
See #24716.

Built from https://develop.svn.wordpress.org/trunk@29074


git-svn-id: http://core.svn.wordpress.org/trunk@28860 1a063a9b-81f0-0310-95a4-ce76da25c4cd