Revert 66431 (Site editor: remove "default" admin CSS)

andrewserong commented 4 days ago

What?

Reverts #66431

Why?

While a well-intentioned change to remove unnecessary CSS, it turns out #66431 caused a regression in the site editor in mobile viewport sizes where the admin markup is exposed unexpectedly.

A longer-term solution might be to see if we can skip the admin markup entirely for site-editor.php, however for now, in order to ensure things are working well on trunk, this PR proposes reverting.

How?

Revert the change in #66431

Testing Instructions

On trunk open up the site editor in a mobile viewport size. Notice that above the content of the site editor the WP admin UI markup is unexpectedly displayed.
With this PR applied, the site editor should work as it did before on mobile and other viewport sizes

Screenshots or screencast

Before	After

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andrewserong commented 4 days ago

Thanks for the quick reviews! 🙇

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