The Publish navigate region focus style hides the whole sidebar

[afercia]

Description

This appears to be a regression after #47734.

The CSS changes from #47734 fixed the publish sidebar when saving multi-entities but broke the focus style of the Publish region when normally navigating through the editor regions.

When the Publish region is focused, the whole sidebar is now hidden under a white container. Also, the focus style extends to the whole sidebar, while it should show only around the 'Open publish panel' container.

Step-by-step reproduction instructions

• Open the post editor.
• Use the Control + backtick keyboard shortcut (or the alternative shortcuts) to navigate through the editor regions.
• Navigate to the Publish region i.e.: the one that contains the button 'Open publish panel' .
• Observe a white container shows up and hides the whole sidebar.
• Observe the focus style extends to the whole white container.
• See screenshots for clarity.

To confirm the regression:

• Revert the CSS changes from Fix multi entities saved state in the post editor #47734
• Specifically, this change: https://github.com/WordPress/gutenberg/pull/47734/files#diff-eafe5c0c08285ac8baec6e6005cf059bd61d4b53f70cef3a407cfd32f27373b8L182-R196
• Hard refresh and re-test.
• Observe the focus style is now correct (but of course the multi-entity saving panel would be still broken)

Note: It's perfectly understandable that such visual regressions occur. However, this is not the first time the navigate region focus style breaks. It broke several times, actually. One more reason to take into strong consideration the introduction of visual regression testing, see for example a related Draft PR here: #46210

Screenshots, screen recording, code snippet

Expected:

Actual:

Environment info

No response

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

[afercia]

Additionally, in the Site Editor, the 'Save' region shows the 'Open save panel' container full height and the button is at thte top:

It is expected to show at the bottom right of the screen:

Probably regressed in #47142