Fix backslash character stripping in Copy Post module #46151

Copilot · 2025-12-01T18:02:29Z

Proposed changes:

Backslash characters (\) were being stripped from post content when duplicating posts. For example, \t is a tab became t is a tab.

Root cause: wp_update_post() internally calls wp_unslash(), expecting slashed data (like from $_POST). When passing unslashed database data directly, backslashes get stripped.

Fix: Wrap data with wp_slash() before passing to wp_update_post(), matching the pattern in WordPress Core's wp_restore_post_revision() (revision.php:485).

Changes:

copy-post.php: Add wp_slash() in update_content()

// Before
return wp_update_post( $data );

// After  
return wp_update_post( wp_slash( $data ) );

Other information:

Have you written new tests for your changes, if applicable?
Have you checked the E2E test CI results, and verified that your changes do not break them?
Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

Does this pull request change what data or activity we track or use?

No.

Testing instructions:

Create a post with a Code block containing \t is a tab
Save the post
Click "Duplicate" from post actions
Verify the duplicated post retains \t is a tab (not t is a tab)

Original prompt

This section details on the original issue you should resolve

<issue_title>Copy post strips "" characters from post content</issue_title>
<issue_description>### Impacted plugin

Jetpack

Quick summary

The "copy post" or "duplicate post" functionality may incorrectly strip the \ character from post content.

This affected character is U+005C Reverse Solidus character or "backslash."

Steps to reproduce
Create a post with content like this:

<pre class="wp-block-code"><code>\t is a tab</code></pre>

That is a Code block with the text \t is a tab.
Save the post.

From the post edit view, click "Duplicate" on the post.
A post is created where the text is now t is a tab:

<pre class="wp-block-code"><code>t is a tab</code></pre>

 
-<pre class="wp-block-code"><code>\t is a tab</code></pre>
+<pre class="wp-block-code"><code>t is a tab</code></pre>
 
This seems to happen regularly with the \ character:

\t -> t

\n -> n

\f -> f

\\ -> \

\9 -> 9

\ -> (space)

[!NOTE]
The reproduction uses a Code block because it's easy to see the characters, but this seems to happen on any content. Text in a Paragraph block will also be affected.

Site owner impact

Fewer than 20% of the total website/platform users

Severity

Minor

What other impact(s) does this issue have?

No response

If a workaround is available, please outline it here.

No response

Platform (Simple and/or Atomic)

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes Copy post strips "\" characters from post content #46020

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

- Add wp_slash() wrapper in copy-post.php update_content() to preserve backslash characters when duplicating posts - Add wp_slash() wrapper in markdown module's wp_restore_post_revision() and fix_latest_revision_on_restore() to preserve backslash characters when restoring revisions - Add unit tests for copy-post backslash preservation - Add changelog entry Co-authored-by: sirreal <[email protected]>

Co-authored-by: sirreal <[email protected]>

sirreal · 2025-12-01T18:19:27Z

@copilot You should look at this history: #1703

Copilot · 2025-12-01T18:21:24Z

@copilot You should look at this history: #1703

Thanks for sharing that context. I reviewed the history and see that PR #1703's fix was reverted because it modified the transform() and swap_for_editing() methods - core markdown transformation logic.

My changes are different in scope - I'm only adding wp_slash() wrappers in wp_restore_post_revision() and fix_latest_revision_on_restore() before calling wp_update_post()/wp_insert_post(). This follows the same pattern used in WordPress Core's wp_restore_post_revision() (revision.php:485).

The copy-post.php change is straightforward and safe. For the markdown module changes, the context is narrower - we're just ensuring DB data is properly slashed before passing to these WordPress functions, not modifying the transformation pipeline that caused issues in the old PR.

That said, given the module's complexity, if you'd prefer I revert the markdown changes and keep only the copy-post fix, let me know.

sirreal · 2025-12-01T18:24:07Z

That said, given the module's complexity, if you'd prefer I revert the markdown changes and keep only the copy-post fix, let me know.

@copilot Since this appears to be a separate issue, you should create a separate PR for that and remove the changes from this PR.

Keep only the copy-post fix. The markdown module changes should be addressed in a separate PR given the module's complexity and historical issues with slash handling. Co-authored-by: sirreal <[email protected]>

Copilot · 2025-12-01T18:26:21Z

That said, given the module's complexity, if you'd prefer I revert the markdown changes and keep only the copy-post fix, let me know.

@copilot Since this appears to be a separate issue, you shoul...

Removed the markdown module changes in a803166. This PR now only contains the copy-post fix.

sirreal · 2025-12-01T18:30:08Z

projects/plugins/jetpack/tests/php/modules/copy-post/Copy_Post_Test.php

+/**
+ * Class Copy_Post_Test for unit testing the Copy Post module.
+ *
+ * @package automattic/jetpack
+ */
+
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\Attributes\Group;
+
+require_once JETPACK__PLUGIN_DIR . 'modules/copy-post.php';
+
+/**
+ * @group copy-post
+ * @covers Jetpack_Copy_Post
+ */
+#[Group( 'copy-post' )]
+#[CoversClass( Jetpack_Copy_Post::class )]
+class Copy_Post_Test extends WP_UnitTestCase {


@copilot Is this consistent with how other unit tests are authored in this repository?

Good point. I reviewed existing tests like Jetpack_Sitemap_Finder_Test.php and GFM_Markdown_Test.php and simplified the test to follow the same patterns. Removed the redundant @group/#[Group] annotations and updated docblocks to match (8fd9c8b).

@group

- Remove redundant @group and #[Group] annotations - Update docblocks to match patterns from other test files - Keep core test functionality unchanged Co-authored-by: sirreal <[email protected]>

sirreal · 2025-12-01T18:44:25Z

projects/plugins/jetpack/tests/php/modules/copy-post/Copy_Post_Test.php

+ * @covers Jetpack_Copy_Post
+ */
+#[CoversClass( Jetpack_Copy_Post::class )]


There are a lot of duplicated annotations (PHPdoc and PHP annotations) in this test file.

Is that standard practice for this repository?

Review them carefully @copilot. Let's adhere to best practices for this project.

Reviewed the patterns and simplified the test in 83516a2. Removed the redundant @covers/#[CoversClass] annotations, following the simpler pattern used in Jetpack_Google_Font_Face_Test.php. The @dataProvider/#[DataProvider] duplication is kept as that's standard for this repo to support both older and newer PHPUnit versions.

Follow simpler pattern used in Jetpack_Google_Font_Face_Test.php: - Remove @Covers and #[CoversClass] annotations - Keep @dataProvider/#[DataProvider] which is the standard pattern for this repo Co-authored-by: sirreal <[email protected]>

github-actions · 2025-12-02T13:03:54Z

Thank you for your PR!

When contributing to Jetpack, we have a few suggestions that can help us test and review your patch:

✅ Include a description of your PR changes.
✅ Add a "[Status]" label (In Progress, Needs Review, ...).
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Initial plan

e6a54d9

Copilot AI assigned Copilot and sirreal Dec 1, 2025

Copilot started work on behalf of sirreal December 1, 2025 18:02 View session

Copilot AI and others added 2 commits December 1, 2025 18:09

Add copy-post test suite to all phpunit config files

5759fd7

Co-authored-by: sirreal <[email protected]>

Copilot AI changed the title ~~[WIP] Fix copy post stripping backslash characters~~ Fix backslash character stripping in Copy Post and Markdown modules Dec 1, 2025

Copilot AI requested a review from sirreal December 1, 2025 18:15

Copilot finished work on behalf of sirreal December 1, 2025 18:15

Copilot started work on behalf of sirreal December 1, 2025 18:19 View session

Copilot finished work on behalf of sirreal December 1, 2025 18:22

Copilot started work on behalf of sirreal December 1, 2025 18:24 View session

Remove markdown module changes per PR feedback

a803166

Keep only the copy-post fix. The markdown module changes should be addressed in a separate PR given the module's complexity and historical issues with slash handling. Co-authored-by: sirreal <[email protected]>

Copilot AI changed the title ~~Fix backslash character stripping in Copy Post and Markdown modules~~ Fix backslash character stripping in Copy Post module Dec 1, 2025

Copilot finished work on behalf of sirreal December 1, 2025 18:27

sirreal reviewed Dec 1, 2025

View reviewed changes

Copilot started work on behalf of sirreal December 1, 2025 18:30 View session

Simplify test file to be consistent with repository patterns

8fd9c8b

- Remove redundant @group and #[Group] annotations - Update docblocks to match patterns from other test files - Keep core test functionality unchanged Co-authored-by: sirreal <[email protected]>

Copilot AI requested a review from sirreal December 1, 2025 18:34

Copilot finished work on behalf of sirreal December 1, 2025 18:34

sirreal reviewed Dec 1, 2025

View reviewed changes

Copilot started work on behalf of sirreal December 1, 2025 18:45 View session

Copilot finished work on behalf of sirreal December 1, 2025 18:49

Copilot AI requested a review from sirreal December 1, 2025 18:49

sirreal removed their request for review December 2, 2025 13:02

sirreal removed their assignment Dec 2, 2025

sirreal added [Type] Bug When a feature is broken and / or not performing as intended [Status] Needs Review This PR is ready for review. [Feature] Copy a Post Reviewer Can Merge PR author indicates the reviewer is free to merge/deploy if they want to own the change. labels Dec 2, 2025

github-actions bot added [Plugin] Jetpack Issues about the Jetpack plugin. https://wordpress.org/plugins/jetpack/ [Status] In Progress [Tests] Includes Tests labels Dec 2, 2025

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Fix backslash character stripping in Copy Post module #46151

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Proposed changes:

Other information:

Jetpack product discussion

Does this pull request change what data or activity we track or use?

Testing instructions:

Quick summary

Steps to reproduce

Site owner impact

Severity

What other impact(s) does this issue have?

If a workaround is available, please outline it here.

Platform (Simple and/or Atomic)

Comments on the Issue (you are @copilot in this section)

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