Adjust focus styling of textarea and input

[dipree]

Closes https://github.com/github/primer/issues/2889

The current focus styling for textarea and input in Primer is using box-shadow with inset and it changes the border-color to achieve what visually looks like a 2px focus "outline".

That doesn't account for scrollbars and renders artifacts in the corners because it's two adjacent 1px lines.

Aside from the visual fixes of the solution in this PR, the one difference is that the additional 1px outline on focus is now outside instead of inside. This behaviour is already being used in the CommentBox.

Changelog

• Avoid potential scrollbars overlapping the border of the Textarea component
• Remove border radius fragments of Textarea, TextInput, TextInputWithTokens and Select componentn when focused
• Retain the box-shadow inset on focus
• Avoid text overlapping the 1px box-shadow inset on focus when scrolling

Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan

Testing & Reviewing

The changes have been tested amongst browsers under macOS and Windows.

TextArea

Firefox:

Before	After

Edge:

Before	After

Safari:

Before	After

TextInput

Before	After

TextInputWithTokens

Before	After

Select

Before	After

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge
• Integration tests pass at github/github (Learn more about how to run integration tests)

Take a look at the What we look for in reviews section of the contributing guidelines for more information on how we review PRs.

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[github-actions]

size-limit report 📦

Path	Size
dist/browser.esm.js	104.35 KB (+0.02% 🔺)
dist/browser.umd.js	104.88 KB (+0.02% 🔺)

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Uh oh! @dipree, the image you shared is missing helpful alt text. Check your pull request body.

Alt text is an invisible description that helps screen readers describe images to blind or low-vision users. If you are using markdown to display images, add your alt text inside the brackets of the markdown image.

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