Navigation screen: blocks can't be dragged into submenus

[tellthemachines]

Description

It's not possible to drag a link into a submenu, because submenus close unless their parent or one of their children is in focus, and dragging a link over the submenu parent doesn't cause the submenu to open.

It's also not possible to move links into or out of submenus with the keyboard, as reported in #33271.

Step-by-step reproduction instructions

Expected behaviour

Actual behaviour

Screenshots or screen recording (optional)

Code snippet (optional)

WordPress information

• WordPress version:
• Gutenberg version:
• Are all plugins except Gutenberg deactivated?
• Are you using a default theme (e.g. Twenty Twenty-One)?

Device information

• Device:
• Operating system:
• Browser:

[Thelmachido]

Closing this issue due to the Navigation Screen project being moved to an inactive status on the feature projects page in coordination with the project leads.

If this work is picked back up, issues can be revisited and reopened as needed.

Thanks for testing this early feature and giving feedback so the wider WordPress project could benefit from the lessons learned!