#36 Retain existing CSS classes on buttons on size change

[Cheffheid]

Closes

WDSBT-63
#36

Description

Updated the way the class name for the custom button size control is handled.

Took inspiration from how Gutenberg handles this for block styles with replaceActiveStyle(), but the gist is that it will create a token list from the existing class names on the block and then removes or adds a class name when appropriate and returns the new value.

So, the current class name will be removed from the list if one exists and a new class name will be added if a size was selected.

Mobile & Desktop Screenshots/Recordings

Added to documentation?

• 📜 README.md
• 📓 Confluence
• 🙅 No documentation needed

Added tests?

• 👍 Yes
• 🙅 No, because they aren't needed
• 🙋 No, because I need help

Testing Instructions

Confirm that you can change the style and size on a button block independently without wiping out one or the other.

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Reviewer's Testing Checklist

As a reviewer, please verify that the relevant testing criteria are fulfilled and confirmed before approving this Pull Request.

• Visual Regression Testing: Ensure that existing functionality is not negatively impacted by the changes.
• Cross-Browser Compatibility: Test on major browsers (Chrome, Firefox, Safari) to ensure compatibility.
• Mobile Responsiveness: Confirm that the changes are responsive and functional on various mobile devices.
• Theme Compatibility: Ensure that the changes do not adversely affect the site's theme and styling.
• Linting: Check that the code passes all linting checks (PHPCS, ESLint, SassLint). Check if PR passes code quality check.
• Accessibility Testing: Validate that the changes comply with accessibility standards. Run npm run a11y.
• Security Best Practices: Ensure that the code follows WordPress security best practices. Check if PR passes security check.
• Documentation: Ensure that any new features or changes are appropriately documented in the README.md or Confluence.
• Post-Deployment Tasks: Check if there are any tasks that need to be performed after deployment.

[optional] Additional Reviewer Notes or Considerations?

[thatmitchcanter]

Good to go. Thanks!