Forward pingback IP during pingback verification.

props tellyworth, nacin.
fixes #27613.


git-svn-id: https://develop.svn.wordpress.org/trunk@27872 602fd350-edb4-49c9-b593-d223f7449a82
Clarify inline documentation for the 'html5' case and PHPDoc return in `add_theme_support()`.

Props jond3r.
Fixes #27278.


git-svn-id: https://develop.svn.wordpress.org/trunk@27879 602fd350-edb4-49c9-b593-d223f7449a82
Clarify PHPDoc return description for `media_handle_upload()`.

Props jdgrimes.
Fixes #27519.


git-svn-id: https://develop.svn.wordpress.org/trunk@27880 602fd350-edb4-49c9-b593-d223f7449a82
Revert [27654] for strings.

props westonruter.
fixes #27485.

git-svn-id: https://develop.svn.wordpress.org/trunk@27890 602fd350-edb4-49c9-b593-d223f7449a82
Widget Customizer: Remove WidgetCustomizer.showFirstSidebarIfRequested().

It's currently unused and needs another iteration.

see #27290.

git-svn-id: https://develop.svn.wordpress.org/trunk@27891 602fd350-edb4-49c9-b593-d223f7449a82
Widget Customizer: Use postMessage to highlight widgets in preview or sections/controls in Customizer.

fixes #27622.

git-svn-id: https://develop.svn.wordpress.org/trunk@27892 602fd350-edb4-49c9-b593-d223f7449a82
Cleanup [27892].

git-svn-id: https://develop.svn.wordpress.org/trunk@27893 602fd350-edb4-49c9-b593-d223f7449a82
27619: Scripts from plugins can be missing
Make `<audio>` elements in playlists responsive.

See #27625.



git-svn-id: https://develop.svn.wordpress.org/trunk@27894 602fd350-edb4-49c9-b593-d223f7449a82
27619: Add a div#widgets-right container element to customizer for compat with widget scripts that do event delegation from that element; less hacky hack
Do admin_enqueue_scripts after enqueueing customize-widgets
Merge branch 'trac-27619' into widget-customizer-patches

Conflicts:
	src/wp-includes/class-wp-customize-widgets.php
Call MediaElement's shim method for `setSrc()` when dynamically updating the playing source in playlists, which will properly set the source for mobile.

Make the labels for playlist items slightly smaller to account for size on mobile.

Fixes #27625.



git-svn-id: https://develop.svn.wordpress.org/trunk@27895 602fd350-edb4-49c9-b593-d223f7449a82
27491: Restore live update mode if sanitized fields are now aligned with the existing fields
Merge branch 'trac-27491' into widget-customizer-patches
Theme Installer fixes:
 * Better more filters section. props sonjanyc for some mockups.
 * Better handling of no results.
 * Use # for hrefs.

props matveb.
see #27055.


git-svn-id: https://develop.svn.wordpress.org/trunk@27896 602fd350-edb4-49c9-b593-d223f7449a82
TinyMCE: update to 4.0.21, see #24067

git-svn-id: https://develop.svn.wordpress.org/trunk@27897 602fd350-edb4-49c9-b593-d223f7449a82
Edit Image modal:
- Move all advanced options under a single “Show advanced options” toggle that mirrors the behavior and look-and-feel of the wplink modal.
- Switch to using <select> for the Size and Link To.
- Bring back the field for CSS Class for the image, but don’t incorporate the internally managed WordPress classes (size-, wp-image-, etc…).
- On larger screen sizes, float labels to the left. When the width drops below 900px, stack the label above the fields.
- Keep image at top on screen sizes where the two columns are stacked into a single column.
- Don't replace the nodes in the editor DOM so we don't stomp on any custom attributes that the user may have added via the Text editor or some other mechanism.
Props gcorne, see #27366

git-svn-id: https://develop.svn.wordpress.org/trunk@27898 602fd350-edb4-49c9-b593-d223f7449a82
Gallery preview: add a "No items found" state which is displayed when rendering the gallery wpview and no attachments are found. Props gcorne, fixes #27558

git-svn-id: https://develop.svn.wordpress.org/trunk@27899 602fd350-edb4-49c9-b593-d223f7449a82
wpLink: fix spinners selectors and add some throttling when searching with AJAX while the user is typing, fixes #27615

git-svn-id: https://develop.svn.wordpress.org/trunk@27900 602fd350-edb4-49c9-b593-d223f7449a82