Description

If the "Contain text cursor inside block" preference is enabled in the post editor, it is impossible to add a block to an empty inner block area using only the keyboard, for example, inside a newly-added Group or Submenu block.

When the text cursor is contained inside the block, it's not possible to use arrow key navigation between blocks in Edit mode, and in Navigation mode the block inserter isn't selectable.

I'm not sure what the best solution would be. Could add the inline inserter to the tabbing order perhaps?

Step-by-step reproduction instructions

1. In Options > Preferences > Blocks, enable "Contain text cursor inside block".
2. Add a Group block and try to open the inserter inside it with the keyboard only.
3. In a Navigation block, add a Submenu and try to navigate to the inserter inside the submenu area with the keyboard only.

Screenshots, screen recording, code snippet

No response

Environment info

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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