Layout wideSize max viewport width for font size not working in the editor

[tellthemachines]

Description

#49815 introduced using theme.json settings.layout.wideSize as a max viewport width for the fluid typography calculation. Testing with Twenty Twenty Three and both WP 6.3 and the latest from this repo, that max width is being respected on the front end but not on the editor.

Step-by-step reproduction instructions

1. With TT3 enabled with default values, inspect a text element while resizing the browser window in the editor.
2. Verify that the font size continues to increase past 1200px viewport.
3. The same inspection in the front end shows the font size not increasing past 1200px.

Screenshots, screen recording, code snippet

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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