Upgrader: Allow plugins to short-circuit the package download. Props rmccue and DrewAPicture. Fixes #22378

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Inline documentation for get_comment_reply_link() and 'comment_reply_link' filter.

props DrewAPicture.
fixes #25310.
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Inline documentation for hooks in wp-includes/author-template.php.

props Frank Klein.
see #25229.
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* Avoid notices in `tests/ajax/Autosave` by bailing early when `get_post()` returns nothing.
* Check for the existence of `$_POST['catslist']` before using it in `wp_ajax_autosave()`.

See #25282.


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Fix some undefined index notices related to Comment unit tests:
* There are several places where a `$_POST` index was unchecked before setting a variable
* In `wp_notify_postauthor()`, `$comment` was being returned null, but its properties were being accessed.
* In `check_ajax_referer()`, 3 different values can be checked for nonce on `$_REQUEST`, but only 1 had an `isset()`

See #25282.


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Inline documentation for hooks in wp-admin/includes/comment.php.

props mordauk.
see #25229.
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Inline documentation for hooks in wp-admin/export.php.

props mordauk.
see #25229.
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Account for Windows and CLI instances in wp_guess_url(). Props SergeyBiryukov. See #25317

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