Global Styles: Reset to defaults action is not working

[andrewserong]

Description

In trunk, within global styles, the Reset to defaults action appears not to be working. From running a git bisect, it appears that the change that introduced the regression was #44770 (the PR that introduced the new browse mode).

Kudos @tellthemachines for flagging the issue!

Step-by-step reproduction instructions

On trunk, open up global styles in a site that has user styles, and attempt to reset the global styles back to the theme defaults. As of #44770, it appears that the drop-down control to reset to defaults no longer works.

For a commit that still works (e.g. prior to #44770) you can checkout 51f0b77, or really any prior to #44770.

Screenshots, screen recording, code snippet

trunk	when it was working previously

Environment info

• WP 6.1.1
• Gutenberg trunk

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

[andrewserong]

Pinging a few folks who worked on #44770 and/or reviewed: @youknowriad, @ntsekouras, @scruffian for visibility.

[ramonjd]

Looks like it's because <SidebarComplementaryAreaFills /> has been placed outside the global context provider

[andrewserong]

We have a fix open in: #46486