Allow to customize insert/edit link dialog box

[madeincima01]

Actually isn't simple to add attributes to the link in the editor (for example custom "class" or "rel"). There isn't any simple way to add a new field/checkbox in the insert/edit link dialog box. The public function wp_link_dialog() in wp-includes/class-wp-editor.php hasn't any hooks or filters. Maybe it would be useful add some possibilites to edit this popup if needed.

[afercia]

Removing the accessibility focus, as per today's bug scrub.

[noisysocks]

Being able to extend the link popover in the block editor has been requested here:

​https://github.com/WordPress/gutenberg/issues/11599

I'm going to close this out in favour of that issue as we generally are not accepting enhancements to the classic editor.

[munabhai]

You already extended
😁😁😁😁😁