Fixed : Metaboxes overlap Block Editor's edit link popup

[narenin]

Fix: #64812

What?

This PR will fixed the Metaboxes overlap Block Editor's edit link popup issue, mentioned in 64812

Why?

This issue happening because of the z-index and this PR will add the z-index to fix the overlapping issue.

How?

I have added the z-index: -1 to metabox class edit-post-layout__metaboxes.

Testing Instructions

• Install and activate any plugin that adds meta boxes to the post page
• Create a new post
• Copy/paste the first five (5) paragraphs of Lorem Ipsum into the body, this should automatically create five paragraph blocks.
• Ensure that the metabox(es) is(are) expanded, extending the scroll height of the page.
• Scroll down so that the bottom of the editor where it meets the metaboxes are in the middle of the page.
• Highlight the last word with your mouse and then press CTRL + K to add a link, this reveals the link editor's popup box below the highlighted text and displays behind the metabox(es).

[github-actions]

The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

If you're merging code through a pull request on GitHub, copy and paste the following into the bottom of the merge commit message.

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

To understand the WordPress project's expectations around crediting contributors, please review the Contributor Attribution page in the Core Handbook.

[t-hamano]

Thanks for the PR.

This problem has been fixed in #63939. This fix will be available in the next minor WordPress release.

[github-actions]

Warning: Type of PR label mismatch

To merge this PR, it requires exactly 1 label indicating the type of PR. Other labels are optional and not being checked here.

• Type-related labels to choose from: [Type] Automated Testing, [Type] Breaking Change, [Type] Bug, [Type] Build Tooling, [Type] Code Quality, [Type] Copy, [Type] Developer Documentation, [Type] Enhancement, [Type] Experimental, [Type] Feature, [Type] New API, [Type] Task, [Type] Technical Prototype, [Type] Performance, [Type] Project Management, [Type] Regression, [Type] Security, [Type] WP Core Ticket, Backport from WordPress Core.
• Labels found: [Feature] Meta Boxes.

Read more about Type labels in Gutenberg. Don't worry if you don't have the required permissions to add labels; the PR reviewer should be able to help with the task.