Restore / re-tools some docs after [27313].

See #26631.


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Rather than extending `media.controller.CollectionAdd` 3 times, make it a constructor that dynamically extends `media.controller.Library` and use instances of it instead.

See #26631.


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Avoid an undefined index notice in wp_doc_link_parse().

props pross for initial patch.
fixes #27214.
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Remove temporary hooks added in [26865].

fixes #26661.
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Use a consistent format for translator comments.

props GaryJ.
fixes #27228.
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Don't filter out network-only plugins from the Plugins screen if they're individually active on the current site. Add some code comments for clarity. Props mordauk
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Allow rewrite endpoints to specify a query variable name. Fixes #20905.
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* Videos should always render at the same aspect ratio.
* Don't force a pseudo-mime-type for `.m4v` files
* Uniformly adapt to `$content_width` when setting video dimensions on the front end
* Add the `height` attribute to the initial `<video>` in the video playlist JS template
* Add some defensive/responsive CSS for a/v on the Edit Media page

See #27243.


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Add some missing number i18n in `Walker_Category` and `Walker_CategoryDropdown`. Fixes #22745.
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in TwentyFourteen: don't add the `has-post-thumbnail` class or print the featured image when viewing an attachment.

See #27243.


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In TwentyTwelve and TwentyThirteen, don't print the featurd image when viewing an attachment.

See #27243.


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Correct the inline docs for `timer_stop()`. Fixes #26874. Props jackreichert
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Enable previews for all pages of multi-page posts. Fixes #17157. Props solarissmoke, chrisscott
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Pass along preview query args only if they are already present. Avoids sloppily appending a preview nonce when there should not be one. See #17157.
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Inline documentation fixes for `timer_stop()`.

See #26874.

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Upgrader: Copy wp-includes/version.php over last, to avoid an installation failing with the new version.php in place. Fixes #25860

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Upgrader: Remove two stray spaces. See #25860

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Upgrader: Remove some debug from r27336. See #25860

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Upgrader: Remove more debug from r27336. See #25860

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Plupload: remove the (old) plupload.silverlight.xap, remove the "executable" prop from Moxie.xap, see #25663
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