Font size presets inconsistent with the global fluid typography setting.

[matiasbenedetto]

Description

The font size preset UI is inconsistent regarding the global fluid typography setting. If the setting is not enabled, the fluid typography UI is still available to users, but the saved settings have no impact on the frontend because the fluid settings make no impact when the "fluid":true isn't set in the settings.typography path of the theme.json file.

Fixing this issue is an alternative to another issue: make the 'local' fluid setting work despite the global one. Depending on the decision on #64766 Should a particular 'fluid' setting of a font size preset work if the global typography.fluid setting is not set or is false? we can close this issue as not valid.

Step-by-step reproduction instructions

1. Use or create a theme without the "fluid":true set in the settings.typography path of the theme.json file.
2. Navigate to the typography settings of the editor.
3. Enter the font size presets and edit a font size preset.
4. Check that you can mark the fluid option of the font size preset.

This isn't consistent because despite adding those settings, they won't impact the rendering of the font sizes because the global fluid is not set.

Screenshots, screen recording, code snippet

Environment info

• Gutenberg trunk
• WordPress 6.6.1

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