XML-RPC: Add wp.deleteMediaItem as an alias to wp_deletePost.

props fahmiadib.
fixes #5310.
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Slightly bump up the login logo size to avoid getting chopped off by Firefox's rounding problems. props SergeyBiryukov for the initial patch. fixes #28393.

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Fix unexpected replacement of a previous tag when selecting a tag from autosuggest results.

props camdensegal.
fixes #28471.
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Use less greedy regex in `wptexturize()`. Adds unit tests.

Props miqrogroove.
See #28564.

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XML-RPC: Make sure wp.newPost does not produce a fatal error when a post_date field is included in the data.

props dllh.
fixes #28601.
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Add a second optional parameter to `absint()` to limit the result to `PHP_INT_MAX`.

See #23383.

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`absint()` should always return `PHP_INT_MAX` if the resulting value exceeds it.

See [28855].
Fixes #23383.

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Revert [28856] at nacin's behest. See #23383.

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Do not touch `absint()`. Reverts [28855].


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Customizer: Introduce a "panel" API to organize multiple sections into a one section.

Create a panel via `$GLOBALS['wp_customize']->add_panel( $panel_id, $args )` and use `$panel_id` for the `panel` argument in `$GLOBALS['wp_customize']->add_section( $section_id, $args )`. That's it.
As an example all widget area sections are now summarized into one panel. Feedback appreciated.

props celloexpressions.
see #27406.
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Make sure the audio player's time tooltip is visible in the media modal for Audio Details.

Fixes #28453.


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Make sure the first number in LIMIT clause in WP_Query::get_posts() is always an integer.

fixes #23383.
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Avoid a PHP notice and warning on language selection screen.

props meekyhwang.
fixes #28648.
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TinyMCE: force 'font-weight: bold` for <strong> and <b> inside the editor or Chrome and Safari may replace them with spans on pasting. Fixes #28656.
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Correct filter documentation in wp_nav_menu().

props dlh.
fixes #28657.
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Avoid duplication of callbacks in theme browser sidebar each time the Next or Previous button is clicked.

This makes the collapse/expand button work as expected.

fixes #28581.
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Don't switch contextual help tabs when tabbing around. props neil_pie. see #28209.

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Remove title attributes in `wp_authenticate_username_password()`.

Props joedolson.
Fixes #26547.

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In deprecated media iframe code, `attachment_fields_to_save` filter should not be called twice after initial image upload in post.

Props SergeyBiryukov.
Fixes #20720.

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Remove remaining Heartbeat API experimental notices

Props DH-Shredder.
Fixes #28626.

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