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42596 Commits

Author SHA1 Message Date
Sergey Biryukov 12a36355e6 Code Modernization: Remove a single trailing percent sign before calling `sprintf()` on the `$default` parameter in `get_theme_mod()`. 
This avoids a "Missing format specifier at end of string" fatal error on PHP 8, and maintains the current behaviour.

See #50913.
Built from https://develop.svn.wordpress.org/trunk@49068


git-svn-id: http://core.svn.wordpress.org/trunk@48830 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-29 10:03:08 +00:00
Sergey Biryukov 41681b29b0 Posts, Post Types: Avoid a PHP notice in `wp_get_shortlink()` if the post type is no longer registered. 
Props apedog.
Fixes #51376.
Built from https://develop.svn.wordpress.org/trunk@49067


git-svn-id: http://core.svn.wordpress.org/trunk@48829 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-28 11:53:08 +00:00
Sergey Biryukov f1f579199b Docs: Clarify the `false` return value of `get_post_type_archive_link()` and `get_post_type_archive_feed_link()`. 
See #50768.
Built from https://develop.svn.wordpress.org/trunk@49066


git-svn-id: http://core.svn.wordpress.org/trunk@48828 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-28 11:12:03 +00:00
Sergey Biryukov 249451fe08 Docs: Correct formatting for the `autosave()` function return value in `js/_enqueues/wp/autosave.js`. 
Props dilipbheda, mukesh27.
Fixes #51401.
Built from https://develop.svn.wordpress.org/trunk@49065


git-svn-id: http://core.svn.wordpress.org/trunk@48827 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-28 10:46:05 +00:00
Sergey Biryukov 2cbcc5d548 Media: Make the "Copy URL" button implementation more consistent with other instances in core: 
* Make the "Copied!" text green.
* Make the button verbiage clear that it's copied "to clipboard".

Props garrett-eclipse, mukesh27.
Fixes #51355.
Built from https://develop.svn.wordpress.org/trunk@49064


git-svn-id: http://core.svn.wordpress.org/trunk@48826 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-27 20:48:05 +00:00
TimothyBlynJacobs bed5797cf6 REST API: Support the multipleOf JSON Schema keyword. 
Props yakimun.
Fixes #51022.

Built from https://develop.svn.wordpress.org/trunk@49063


git-svn-id: http://core.svn.wordpress.org/trunk@48825 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-27 19:03:05 +00:00
Sergey Biryukov 6bdbb8b25c Media: Check if the item is defined before setting the `skipHistory` property in media frame router. 
This avoids a JS error when refreshing the "Attachment details" modal for an item that is not currently queried.

Follow-up to [41021].

Props Mista-Flo, mukesh27.
Fixes #51395.
Built from https://develop.svn.wordpress.org/trunk@49062


git-svn-id: http://core.svn.wordpress.org/trunk@48824 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-27 08:50:06 +00:00
Sergey Biryukov c298458751 Docs: Add missing `@return` tags for some `WP_Automatic_Updater` methods: 
* `::is_vcs_checkout()`
* `::should_update()`
* `::send_core_update_notification_email()`

Props ankitmaru, mukesh27.
Fixes #51385.
Built from https://develop.svn.wordpress.org/trunk@49061


git-svn-id: http://core.svn.wordpress.org/trunk@48823 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-27 08:36:06 +00:00
Sergey Biryukov d36da091c4 Taxonomy: Restore documentation for the `taxonomy` parameter of `wp_list_categories()`. 
The parameter's default value is different from the one in `WP_Term_Query::__construct()`, and should be documented accordingly.

This also clarifies that the `taxonomy` parameter of `wp_list_categories()` only accepts a string, not an array.

Follow-up to [40903], [41767], [45894], [45895].

Props grapplerulrich, mukesh27, TimothyBlynJacobs, SergeyBiryukov.
Fixes #51378. See #47896.
Built from https://develop.svn.wordpress.org/trunk@49060


git-svn-id: http://core.svn.wordpress.org/trunk@48822 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-27 08:19:04 +00:00
Sergey Biryukov 5c3a734df0 Docs: Correct description for the `taxonomy` parameter of `wp_dropdown_categories()`. 
Follow-up to [40903], [41767].

Props grapplerulrich, mukesh27, TimothyBlynJacobs.
See #51378.
Built from https://develop.svn.wordpress.org/trunk@49059


git-svn-id: http://core.svn.wordpress.org/trunk@48821 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-27 07:49:06 +00:00
Sergey Biryukov a8b070b56b Docs: Fix typo in a comment in `js/media/routers/manage.js`. 
Props mukesh27, garrett-eclipse.
Fixes #51397.
Built from https://develop.svn.wordpress.org/trunk@49058


git-svn-id: http://core.svn.wordpress.org/trunk@48820 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-27 07:38:05 +00:00
Sergey Biryukov bf2edf9cab External Libraries: Backport a commit from sodium_compat trunk to fix a PHP 8 error. 
This addresses an "Undefined constant `MB_OVERLOAD_STRING`" fatal error in the `ParagonIE_Sodium_Core_Util::isMbStringOverride()` method.

In PHP 8, the `MB_OVERLOAD_STRING` constant has been removed, along with the `mbstring` function overloading feature.

Fixes #51399.
Built from https://develop.svn.wordpress.org/trunk@49057


git-svn-id: http://core.svn.wordpress.org/trunk@48819 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-27 05:17:05 +00:00
Sergey Biryukov 67752b98e0 Upgrade/Install: Update sodium_compat to v1.13.0. 
This includes a few autoloader fixes and improvements.

A full list of changes in this update can be found on GitHub:
https://github.com/paragonie/sodium_compat/compare/v1.12.1...v1.13.0

See #51399.
Built from https://develop.svn.wordpress.org/trunk@49056


git-svn-id: http://core.svn.wordpress.org/trunk@48818 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-27 04:46:05 +00:00
TimothyBlynJacobs 0db3f859ea Add ircs and irc6 to the list of allowed protocols. 
This adds support for the secure and ipv6 variants of the already allowed irc protocol.

Props arealnobrainer, markparnell, ctmartin.

Built from https://develop.svn.wordpress.org/trunk@49055


git-svn-id: http://core.svn.wordpress.org/trunk@48817 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-26 21:02:04 +00:00
TimothyBlynJacobs bf397c8d89 REST API: Correct @since version after [49053]. 
See #51023.

Built from https://develop.svn.wordpress.org/trunk@49054


git-svn-id: http://core.svn.wordpress.org/trunk@48816 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-26 18:56:04 +00:00
TimothyBlynJacobs 9951662ebb REST API: Support the minProperties and maxProperties JSON Schema keywords. 
Props yakimun.
Fixes #51023.

Built from https://develop.svn.wordpress.org/trunk@49053


git-svn-id: http://core.svn.wordpress.org/trunk@48815 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-26 18:20:07 +00:00
Sergey Biryukov c9def12900 Tests: Require `imagejpeg()` function in `WP_Widget_Media_Image::render_media()` test. 
This outputs a proper message if the requirement is not met, instead of an obscure failure further in the test.

This test relies on multiple resized copies of a test JPEG image being generated and available.

Follow-up to [49010], [49024], [49025], [49045], [49050].

See #50639, #50640.
Built from https://develop.svn.wordpress.org/trunk@49052


git-svn-id: http://core.svn.wordpress.org/trunk@48814 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-26 14:52:07 +00:00
Sergey Biryukov 2e56bb91a8 Tests: Correct assertion in `WP_Test_REST_Comments_Controller::check_comment_data()`. 
`author_avatar_urls` should be present in the comment data array keys, not values.

The test only passed accidentally due to `assertContains()` not performing a strict type check.

See #38266, #50913.
Built from https://develop.svn.wordpress.org/trunk@49051


git-svn-id: http://core.svn.wordpress.org/trunk@48813 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-26 03:14:07 +00:00
Sergey Biryukov cd1f30e28d Tests: Require `imagejpeg()` function in one more media test. 
This outputs a proper message if the requirement is not met, instead of an obscure failure further in the test.

This test relies on multiple resized copies of a test JPEG image being generated and available.

Follow-up to [49010], [49024], [49025], [49045].

See #50639, #50640.
Built from https://develop.svn.wordpress.org/trunk@49050


git-svn-id: http://core.svn.wordpress.org/trunk@48812 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-26 02:34:06 +00:00
Sergey Biryukov 346794bc57 Upload: Add a check in `wp_check_filetype_and_ext()` to account for CSV files having the `application/csv` MIME type. 
Previously, the PHP Fileinfo extension used to detect CSV files as `text/plain`.

In PHP 8, this has changed, and CSV files are detected as `application/csv`.

Follow-up to [44438].

See #50913.
Built from https://develop.svn.wordpress.org/trunk@49049


git-svn-id: http://core.svn.wordpress.org/trunk@48811 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-26 01:11:09 +00:00
John Blackbourn eaf325e386 Upgrade/Install: Introduce the `wp_installed_email` filter for filtering the contents of the email sent when WordPress is installed, without needing to override the `wp_new_blog_notification()` pluggable function. 
Props Dharm1025, nikolam, johnbillion

Fixes #42133

Built from https://develop.svn.wordpress.org/trunk@49048


git-svn-id: http://core.svn.wordpress.org/trunk@48810 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-25 22:33:08 +00:00
Sergey Biryukov fe9e57c1c3 Tests: Require `imagejpeg()` function in some REST API attachments controller tests. 
This outputs a proper message if the requirement is not met, instead of an obscure failure further in the test.

These tests rely on multiple resized copies of a test JPEG image being generated and available.

Follow-up to [49010], [49024], [49025], [49045].

See #50639, #50640.
Built from https://develop.svn.wordpress.org/trunk@49047


git-svn-id: http://core.svn.wordpress.org/trunk@48809 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-25 02:23:04 +00:00
Sergey Biryukov 5d31e4368e Tests: Correct the check for image sizes in some REST API attachments controller tests. 
If the sizes data could not be retrieved, the controller returns an empty object instead of an array.

This makes sure that the value is in fact an array before proceeding, and outputs a proper message in case of failure, instead of an obscure PHP error further in the test.

Follow-up to [49044].

See #50913, #51393.
Built from https://develop.svn.wordpress.org/trunk@49046


git-svn-id: http://core.svn.wordpress.org/trunk@48808 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-25 02:11:03 +00:00
Sergey Biryukov 0485a4ad01 Tests: Require `imagejpeg()` function in some more media tests. 
This outputs a proper message if the requirement is not met, instead of an obscure PHP error further in the test.

These tests rely on multiple resized copies of a test JPEG image being generated and available.

Follow-up to [49010], [49024], [49025].

See #50639, #50640.
Built from https://develop.svn.wordpress.org/trunk@49045


git-svn-id: http://core.svn.wordpress.org/trunk@48807 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-25 01:45:04 +00:00
Sergey Biryukov 312f42f375 Tests: Check if image sizes were successfully retrieved in some REST API attachments controller tests. 
This outputs a proper message in case of failure, instead of an obscure PHP error further in the test.

Props TimothyBlynJacobs.
See #50913, #51393.
Built from https://develop.svn.wordpress.org/trunk@49044


git-svn-id: http://core.svn.wordpress.org/trunk@48806 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-25 01:31:04 +00:00
Sergey Biryukov 4f8f42747f Code Modernization: Correct the check for `parent` argument in `wp_insert_term()` and `wp_update_term()`. 
PHP 8 changes the way string to number comparisons are performed: https://wiki.php.net/rfc/string_to_number_comparison

In particular, checking if a non-empty, non-numeric string is greater than zero in PHP 8 evaluates to `true`, not `false`.

For `wp_insert_term()`, this resulted in a "Parent term does not exist" error for a non-numeric string, instead of discarding the value.

By explicitly casting the value to `int`, we make sure to compare both values as numbers, rather than a string and a number.

Follow-up to [29196], [29830], [29867].

See #50913.
Built from https://develop.svn.wordpress.org/trunk@49043


git-svn-id: http://core.svn.wordpress.org/trunk@48805 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-25 00:04:04 +00:00
Sergey Biryukov cfe5b1c9f2 Docs: Add a `@since` note to `wp_privacy_exports_dir` and `wp_privacy_exports_url` filters about exports using relative paths since WordPress 5.5. 
When changing exports location via these filters, make sure to migrate the files to the new directory, to avoid breaking any existing exports.

Follow-up to [48127], [48330].

Props garrett-eclipse.
Fixes #51361.
Built from https://develop.svn.wordpress.org/trunk@49042


git-svn-id: http://core.svn.wordpress.org/trunk@48804 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-24 05:00:06 +00:00
noisysocks 8fa8aad136 Documentation: Add 'template' arg documentation 
Add inline documentation for the 'template' arg accepted by
register_post_type().

Props milana_cap.
See #46261.

Built from https://develop.svn.wordpress.org/trunk@49041


git-svn-id: http://core.svn.wordpress.org/trunk@48803 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-24 03:12:04 +00:00
noisysocks 41b456eca9 Editor: Hide Screen Options tab from block editor 
The block editor provides its own interface for managing screen options, so we
can safely hide Screen Options tab found in the top right of the page.

Props aduth.
See #46157.

Built from https://develop.svn.wordpress.org/trunk@49040


git-svn-id: http://core.svn.wordpress.org/trunk@48802 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-24 03:00:08 +00:00
Sergey Biryukov c10acd850e Build/Test Tools: Use trunk revision 2387243 of the WordPress Importer plugin. 
This revision includes a change to only call `libxml_disable_entity_loader()` in PHP < 8, in order for unit tests in the `import` group to pass on PHP 8.

This function has been deprecated in PHP 8.0 because in libxml 2.9.0, external entity loading is disabled by default, so this function is no longer needed to protect against XXE attacks.

Follow-up to [46542], [48789].

Props jrf.
See #50913.
Built from https://develop.svn.wordpress.org/trunk@49039


git-svn-id: http://core.svn.wordpress.org/trunk@48801 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-23 18:39:07 +00:00
Sergey Biryukov 5c1889f3d8 Docs: Remove obsolete `$wpdb` global reference from `get_site_by_path()`. 
Follow-up to [37628].

Props ravivaddweb, mukesh27.
Fixes #51380.
Built from https://develop.svn.wordpress.org/trunk@49038


git-svn-id: http://core.svn.wordpress.org/trunk@48800 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-23 14:11:07 +00:00
Sergey Biryukov a610519297 Tests: Backport two changes from PHPUnit 9.3: 
* Replace the `Match` interface with `ParametersMatch`, to avoid parse errors due to `match` being a reserved keyword in PHP 8.
* Replace `ReflectionParameter::getClass()` usage, which is deprecated in PHP 8.

This allows tests relying on the `getMockForAbstractClass()` and `getMockBuilder()` methods to run again on PHP 8.

When the test suite is updated for compatibility with PHPUnit 9.x, these overrides can be removed.

Follow-up to [48972].

See #50913, #50902.
Built from https://develop.svn.wordpress.org/trunk@49037


git-svn-id: http://core.svn.wordpress.org/trunk@48799 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-23 13:54:07 +00:00
Sergey Biryukov d4a319c453 Users: Check if the user ID passed as `selected` to `wp_dropdown_users()` corresponds to an existing user. 
This avoids a few PHP notices if the `include_selected` parameter was specified and a non-existing user ID was passed.

Props campusboy1987.
Fixes #51370.
Built from https://develop.svn.wordpress.org/trunk@49036


git-svn-id: http://core.svn.wordpress.org/trunk@48798 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-23 00:27:07 +00:00
desrosj a16faa6989 Privacy: Ensure bulk action related strings end with periods. 
Props garrett-eclipse, mukesh27.
Fixes #51371.
Built from https://develop.svn.wordpress.org/trunk@49035


git-svn-id: http://core.svn.wordpress.org/trunk@48797 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-22 18:40:04 +00:00
desrosj 6ff2fbb6cd External Libraries: Upgrade PHPMailer to version 6.1.7. 
For a full list of changes in this update, see the PHPMailer GitHub: https://github.com/PHPMailer/PHPMailer/compare/v6.1.6...v6.1.7.

Props ayeshrajans, jrf.
Fixes #51311.
Built from https://develop.svn.wordpress.org/trunk@49034


git-svn-id: http://core.svn.wordpress.org/trunk@48796 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-22 18:37:08 +00:00
Sergey Biryukov b7431cfa83 Tests: Use consistent trailing punctuation in `fail()` messages. 
See #51344.
Built from https://develop.svn.wordpress.org/trunk@49033


git-svn-id: http://core.svn.wordpress.org/trunk@48795 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-22 12:34:04 +00:00
Sergey Biryukov d9346ea967 Tests: Check if image metadata for a particular size was successfully retrieved in some media tests. 
This outputs a proper message in case of failure, instead of an obscure PHP error further in the test.

See #50913.
Built from https://develop.svn.wordpress.org/trunk@49032


git-svn-id: http://core.svn.wordpress.org/trunk@48794 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-22 12:32:07 +00:00
TimothyBlynJacobs 883ace38f1 REST API: Regenerate test fixtures after [48982]. 
Props garrett-eclipse.
Fixes #50805.

Built from https://develop.svn.wordpress.org/trunk@49031


git-svn-id: http://core.svn.wordpress.org/trunk@48793 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-21 22:54:06 +00:00
Sergey Biryukov 5d99107bf3 Tests: Fix typo in some `markTestSkipped()` messages. 
See #51344.
Built from https://develop.svn.wordpress.org/trunk@49030


git-svn-id: http://core.svn.wordpress.org/trunk@48792 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-21 20:20:07 +00:00
John Blackbourn 175c2c5b7c Users: Introduce the `invited_user_email` filter for filtering the contents of the email sent when an existing user is invited to a site on Multisite. 
Props contact-banker, anand.au14, nikolam, johnbillion

Fixes #42132

Built from https://develop.svn.wordpress.org/trunk@49029


git-svn-id: http://core.svn.wordpress.org/trunk@48791 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-21 17:16:07 +00:00
John Blackbourn aef504acfd Docs: Correct the indentation for some array type docs. 
See #50768

Built from https://develop.svn.wordpress.org/trunk@49028


git-svn-id: http://core.svn.wordpress.org/trunk@48790 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-21 16:46:06 +00:00
Sergey Biryukov 790983eca4 Tests: Use consistent trailing punctuation in `markTestSkipped()` messages. 
See #51344.
Built from https://develop.svn.wordpress.org/trunk@49027


git-svn-id: http://core.svn.wordpress.org/trunk@48789 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-21 14:07:05 +00:00
Sergey Biryukov 29c0edfbba Privacy: Check if the accumulated data in `wp_privacy_process_personal_data_export_page()` is not empty. 
This avoids an error on PHP 8 caused by passing an empty string to `array_merge()`, instead of an array.

See #50913.
Built from https://develop.svn.wordpress.org/trunk@49026


git-svn-id: http://core.svn.wordpress.org/trunk@48788 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-21 13:51:03 +00:00
Sergey Biryukov a95e9a91da Tests: Convert a few more `function_exists()` and `extension_loaded()` checks to `@requires` annotations. 
This better utilizes the PHPUnit native functionality.

Follow-up to [49024].

See #50639, #50640.
Built from https://develop.svn.wordpress.org/trunk@49025


git-svn-id: http://core.svn.wordpress.org/trunk@48787 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-21 13:27:02 +00:00
Sergey Biryukov 1e39e21616 Tests: Convert the checks for `imagejpeg()` function availability to use the `@requires` annotation. 
This better utilizes the PHPUnit native functionality.

Props ayeshrajans, jrf, johnbillion.
Fixes #50639. See #50640.
Built from https://develop.svn.wordpress.org/trunk@49024


git-svn-id: http://core.svn.wordpress.org/trunk@48786 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-21 11:36:04 +00:00
Sergey Biryukov 6e5ca746e1 General: Give the `$is` variable in `is_wp_error()` a more descriptive name. 
Follow-up to [49022].

See #40568.
Built from https://develop.svn.wordpress.org/trunk@49023


git-svn-id: http://core.svn.wordpress.org/trunk@48785 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-21 11:13:05 +00:00
John Blackbourn 964d0784be General: Introduce the `wp_error_added` and `wp_error_checked` actions. 
These actions allow debugging tools to track `WP_Error` instances as they're created and subsequently passed between functions which check for error objects.

Props Shelob9, Mte90, TimothyBlynJacobs, johnbillion

Fixes #40568


Built from https://develop.svn.wordpress.org/trunk@49022


git-svn-id: http://core.svn.wordpress.org/trunk@48784 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-20 17:44:07 +00:00
John Blackbourn aba2165aae Media: Standardise the description for image size parameters. 
This brings continuity to all the image related functions and filters which accept or pass a size parameter.

Props dilipbheda, johnbillion

Fixes #47364

Built from https://develop.svn.wordpress.org/trunk@49021


git-svn-id: http://core.svn.wordpress.org/trunk@48783 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-20 16:23:07 +00:00
John Blackbourn 0b2e31a7f8 Docs: Inline documentation improvements for media related functions and hooks. 
See #47364, #50768

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git-svn-id: http://core.svn.wordpress.org/trunk@48782 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-20 15:55:10 +00:00
Sergey Biryukov 2884b7b1b7 Media: Return a `WP_Error` from `WP_Image_Editor_GD::load()` if file contents could not be retrieved. 
This avoids an error on PHP 8 caused by calling `imagecreatefromstring()` on an empty result.

See #50913.
Built from https://develop.svn.wordpress.org/trunk@49019


git-svn-id: http://core.svn.wordpress.org/trunk@48781 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 2020-09-20 14:28:05 +00:00