Add "Copy to Clipboard" button to Revision Viewer

[MadtownLems]

When looking through old revisions, it would be helpful to be able to copy a Revision's post_content to the clip board (for use elsewhere). Unfortunately, this is very difficult. One can't even easily select the text to copy it, because you get the text from BOTH revisions on screen when you try.

I think each revision should have a "Copy to Clipboard" button at the top so one can easily extract the markup of the revision for use elsewhere.

Created a copy button for revision viewer
Trac ticket: https://core.trac.wordpress.org/ticket/62690

Demo

​https://github.com/user-attachments/assets/fa831b3a-e1b6-43f2-9edc-69bc50a0b1bc

[prasadkarmalkar]

Hi there, I have created a PR for this feature and added a demo video. Please let me know if any changes are needed.
PR link - ​https://github.com/WordPress/wordpress-develop/pull/8079

[sainathpoojary]

Test Report

Description

This report validates whether the indicated patch works as expected.

Patch tested: ​https://github.com/WordPress/wordpress-develop/pull/8079

Environment

• WordPress: 6.8-alpha-59274-src
• PHP: 8.2.27
• Server: nginx/1.27.3
• Database: mysqli (Server: 8.4.3 / Client: mysqlnd 8.2.27)
• Browser: Chrome 131.0.0.0
• OS: macOS
• Theme: Twenty Ten 4.3
• MU Plugins: None activated
• Plugins: Test Reports 1.2.0

Actual Results

✅ Issue resolved with patch.

Supplemental Artifacts

Before:

After:

Video: ​https://rioudcpuyg.ufs.sh/f/PL8E4NiPUWyO0yEWExrm4XQraiwSMvRu9VZ1yNCOA2kz8EBx