Add baseline doc blocks for all ajax handlers in ajax-actions.php.

Fixes #28200.

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git-svn-id: http://core.svn.wordpress.org/trunk@28183 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix mid-file section header style in wp-admin/includes/ajax-actions.php.

See #28200.

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git-svn-id: http://core.svn.wordpress.org/trunk@28184 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add inline documentation of the default arguments for `wp_list_pages()`.

Props garza for the initial patches.
Fixes #11338.

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git-svn-id: http://core.svn.wordpress.org/trunk@28185 1a063a9b-81f0-0310-95a4-ce76da25c4cd
First pass at `wpview` logic for the `[embed]` shortcode. URLs on a their own line are parsed as well. The toolbar will appear with the "remove" button when the view is clicked. Edit has not been implemented yet.

Props avryl, wonderboymusic.
See #28195.


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git-svn-id: http://core.svn.wordpress.org/trunk@28186 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove the `title` attribute from markup generated in `wp-includes/category-template.php`:

* `get_category_parents()`
* `get_the_category_list()`
* `wp_generate_tag_cloud()`
* `Walker_Category::start_el()`	

Props joedolson.
Fixes #26557.	


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git-svn-id: http://core.svn.wordpress.org/trunk@28187 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `WP_Terms_List_Table::single_row()`, call `sanitize_term()` on the passed term (`$tag`).

Props oso96_2000, c3mdigital, scribu. 
It takes a village.
Fixes #16864.

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git-svn-id: http://core.svn.wordpress.org/trunk@28188 1a063a9b-81f0-0310-95a4-ce76da25c4cd
MediaElement players need `clear: both` to play nice with adjacent floated elements.

Fixes #27385.


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git-svn-id: http://core.svn.wordpress.org/trunk@28189 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `get_the_author_posts()`, if there is no current `$post`, return `0` and bail.

Props krogsgard, aaroncampbell.
Fixes #27998.


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git-svn-id: http://core.svn.wordpress.org/trunk@28190 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Support `loop` for `[audio]` and `[video]` shortcodes that specify files that are played using MediaElement's Flash plugin bridge.

Fixes #27368.


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git-svn-id: http://core.svn.wordpress.org/trunk@28191 1a063a9b-81f0-0310-95a4-ce76da25c4cd
When pausing "all" players attached to MCE views, don't reach into global scope and pause "every" player. Only pause the players bound to MCE views.

Fixes #27971.


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git-svn-id: http://core.svn.wordpress.org/trunk@28192 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Update the default (WP-defined) styles for MediaElement players to be more in-line with our flat aesthetic. Use the new official colors. 

Props celloexpressions.
Fixes #27516.


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git-svn-id: http://core.svn.wordpress.org/trunk@28193 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid a notice in `wp_save_image()` by checking `$meta['sizes']['thumbnail']` for `! empty()` before setting a variable to it.

Props MikeHansenMe.
Fixes #17736.


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git-svn-id: http://core.svn.wordpress.org/trunk@28194 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `wp_read_image_metadata()`, the values from `exif_read_data()` should only override values from `iptcparse()` that are empty. 

Props SergeyBiryukov.
Fixes #23706.

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git-svn-id: http://core.svn.wordpress.org/trunk@28195 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `media_upload_gallery_form()`'s inline JavaScript, remove unnecessary comment tags.

Fixes #25637.


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git-svn-id: http://core.svn.wordpress.org/trunk@28196 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In the `Attachment Details` section of the media modal, only add `box-shadow` to images. Other mime-type icons look strange with an arbitrary border.

Props avryl.
Fixes #27949.


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git-svn-id: http://core.svn.wordpress.org/trunk@28197 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Allow users to set overrides for MediaElement instances by always passing `_wpmejsSettings` instead of just `_wpmejsSettings.pluginPath`.

Props Otto42 for the initial patch.
Fixes #25243.


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git-svn-id: http://core.svn.wordpress.org/trunk@28198 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `wp.media.view.Settings::update()`, when handling checkboxes, check for a value of `'false'` in addition to casting `value` to boolean. `!! 'false'` evaluates to `true`.

Props adamsilverstein.
Fixes #23954.


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git-svn-id: http://core.svn.wordpress.org/trunk@28199 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add `xps` and `oxps` extensions to list of supported document types.

More: http://en.wikipedia.org/wiki/Open_XML_Paper_Specification

Fixes #15697.


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