🚀 Description

Minor

Our Form Controls Layout component has been removed. To replace Form Controls Layout, a split attribute has been added to Checkbox, Checkbox Group, Dropdown, Input, Radio Group, Slider, and Textarea.

The value of each component's split attribute matches that of Form Control Layout: split can be 'left", 'middle', 'right', or undefined. You'll need to set split on each component in your form—which isn't as convenient. But it does allow form controls to be laid out independent of Form Controls Layout and of each other if desired.

The impetus for these changes is to prepare for Dropdown moving out of Glide Core:

For components to participate in Form Controls Layout, they previously exposed a privateSplit property that Form Controls Layout set. When Dropdown is moved out of Glide Core, its contract with Form Controls Layout will no longer be guaranteed.

So Dropdown won't be able to participate in Form Controls Layout, and Form Controls Layout would work with every Glide form control component except Dropdown—leaving Dropdown consumers to manually set split on Dropdown.

Rather than oddly have some components that work with Form Controls Layout and some that don't, we decided to remove Form Controls Layout and instead expose split on each component.

I'll wait to merge until @ynotdraw gets back. He'll be interested in reviewing. He may also want to wait to merge until our other unreleased changes have been digested by consuming applications.

📋 Checklist

• I have followed the Contributing Guidelines.
• I have added tests to cover new or updated functionality.
• I have added or updated Storybook stories.
• I have localized new strings.
• I have followed the ARIA Authoring Practices Guide or met with the Accessibility Team.
• I have included a changeset.
• I have scheduled a design review.
• I have reviewed the Storybook and Visual Test Report links below.

🔬 Manual Testing

1. Check out this branch.
2. Select the "visual" project in Playwright's UI and filter by "split=".
3. Run all the filtered visual tests.
4. Spotcheck a handful of test screenshots.
5. Open Storybook.
6. Spotcheck a few stories.