Add safeguards for when ext/hash is not compiled with PHP.

Merges [29751] to the 4.0 branch.

fixes #29518.

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The 4.0 branch is 4.0.1-alpha.

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Plugin search: Wrap results in a form to fix pagination's `paged` input field.

Merges [29829] to the 4.0 branch.

props jesin, ocean90.
fixes #18724.

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Quicktags: move focusing the editor after inserting content to the end of the code blocks.

Merges [29884] to the 4.0 branch.

Fixes a bug in Chrome where both the textarea and the window may auto-scroll to unexpected position on clicking a Quicktags button.

props azaozz, avryl.
fixes #29944.

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Editor-expand: reset the editor height after the window is resized.

Merges [29886] to the 4.0 branch.

props azaozz.
fixes #29952.

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Upgrade MediaElement to 2.15.1.

Merges [29733] to the 4.0 branch.

Changes from 2.15.0:
https://github.com/johndyer/mediaelement/compare/2.15.0...2.15.1

Continues to revert upstream commit b7f82b4 to restore the status quo for Chromium support.

props wonderboymusic.
fixes #29620.

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Revert [28610] in order to avoid infinite redirect loops on reverse proxies which proxy from HTTPS to HTTP.

Merges [30090] to the 4.0 branch.

fixes #28610.

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Make sure we're on the media grid page before calling wp.media().

Merges [29725] to the 4.0 branch.

props azaozz.
fixes #29520.

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Create new $wp_roles object in install_blog() to avoid protected _init() call

Merges [30242] to the 4.0 branch.

Our call to `$wp_roles->_init()` relied on the `__call()` method in `WP_Roles` to handle the link to the protected method. This works back to PHP 5.2.9, when a bug was fixed allowing access to protected methods through this exact approach.

`install_blog()` needs a fresh `$wp_roles` object after `populate_roles()` resets everything in its path. We can create this new object from scratch, effectively doing the same thing with the call to `_init()` via the constructor.

props jeremyfelt.
fixes #29692.

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Editor expand: hide TinyMCE float panels and tooltips when scrolling.

Merges [29738] to the 4.0 branch.

props avryl.
see #29516.

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TinyMCE wpView: when pasting/inserting content before a view, add new paragraph above it and insert the content there.

Merges [29766] to the 4.0 branch.

props avryl.
fixes #29380.

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Make sure the $parent argument of wp_insert_attachment() still works as expected after [28579].

Merges [29745] to the 4.0 branch.

props jesin, dikiy_forester.
fixes #29646.

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Avoid PHP notices in media modal caused by orphaned attachments.

Merges [29724] to the 4.0 branch.

props SergeyBiryukov.
fixes #29566.

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Create correct permalinks for child posts of hierarchical post types when default permalinks are used.

Merges [29765] to the 4.0 branch.

props loushou.
fixes #29615.

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In `wp_audio|video_shortcode()`, make sure that `autoplay` and `loop` are booleans. Passing `'false'` to them will force them to be active, which is bad. 

Merges [30185] to the 4.0 branch.

props wonderboymusic.
fixes #29825.

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Media Frames: Set the box-sizing CSS property to border-box for checkboxes and radio buttons.

Merges [29727] to the 4.0 branch.

props mlteal.
fixes #29493.

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Twenty Fifteen: improve naming and documentation of customizer js files to match core filenaming conventions.

Props celloexpressions, fixes #30160.


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Twenty Fifteen: adding help text to explain how color changes to header and sidebar are affected by responsive design.

Props iamtakashi, iandstewart, fixes #30165.


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Twenty Fifteen: Removing email obfuscation from social links menu.

We really should be doing this in all menus, at which point this becomes core or plugin functionality, not a theme feature.

Closes #30214.


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Twenty Fifteen: add instant updating of color schemes to the customizer with postMessage.

Props celloexpressions, bradyvercher, westonruter, fixes #29988.



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