Description

It's not possible to access the "Add block" feature via keyboard.
Together with @Ryokuhi (Thanks for your help!) we tried to figure out what caused this issue at WCEU2023 contributer day.

It seems to be an issue of tabindex

I guess the affected component might be within PrivateInserter:

Step-by-step reproduction instructions

1. Open gutenberg editor
2. Create a block, e.g. Social Icons block
3. Try to EDIT existing Social Icons block and add a new social icon item by accessing the inserter, using your keyboard

Screenshots, screen recording, code snippet

Environment info

See also: https://wordpress.github.io/gutenberg/?path=/story/playground-block-editor--default to inspect tabindex of the inserter

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