Add https:// to beginning of button links if not already present

[eoinsav]

Description

When adding a link to the Buttons Block, it expects http:// or https:// at the start of a URL.

Say we are adding a Button to myfirstdomain.com, if the link is added as myseconddomain.com (or www.myseconddomain.com) then it will be displayed on the frontend as myfirstdomain.com/myseconddomain.com (or myfirstdomain.com/www.myseconddomain.com).

It works correctly for a regular text link. It will automatically add http:// to the beginning of a link in a Paragraph Block (sort of related).

Step-by-step reproduction instructions

1. Create a Page
2. Add a Buttons Block
3. Type a link without http:// or https://
4. Publish the Page
5. Click the button on the published Page

Environment info

• WordPress Version 6.1.1
• Gutenberg Version 14.7.0

Please confirm that you have searched existing issues in the repo.

Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

Yes