The title of the Widget Group block becomes h2.widget-title.

[ddryo]

Description

Thank you for creating the widget group block.

However, I found one problem.

The title of the Widget Group block becomes h2.widget-title.

The class set in register_sidebar() is not used.

Step-by-step reproduction instructions

1. For example, we can set the Widget Title to div.c-widget__title as follows

register_sidebar(
    array(
        'name'          => 'Sidebar',
        'id'            => 'sidebar-1',
        'before_widget' => '<div id="%1$s" class="c-widget %2$s">',
        'after_widget'  => '</div>',
        'before_title'  => '<div class="c-widget__title">',
        'after_title'   => '</div>',
    )
);

2. Use Widget Group block.

Screenshots, screen recording, code snippet

The div#block-7 at the top of this image is the HTML for using the Widget Group.

And below it, div#categories-2 is the HTML when using the Legacy Widget.

Environment info

• WordPress 5.9 RC4

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

[ddryo]

Additionally, there is a similar problem with #33507

[ddryo]

So, the Title of the Widget area is a situation where various DOMs can be mixed as shown below.

• h2.widget-title (Title of the Widget Group block)
• h2.widgettitle (Title of the Legacy Widget manually placed in the Group block)
• div.c-widget__title (A class specified by the theme. Legacy widgets that have been installed in the past.)
• Just an h2 tag. (A widget tile that is initially placed when we install WordPress 5.8 on our site.)

[annezazu]

@kevin940726 any insight here?

[noisysocks]

This should be fixed by https://core.trac.wordpress.org/changeset/52730. Please test the WP 5.9.1 RC when it is released to confirm.