ActionBar: Add padding to Divider when gap="none"

[liuliu-dev]

Fixes the spacing issue when ActionBar has gap="none" set.

Closes #6136

Changelog

Added conditional horizontal padding (8px on each side) to ActionBar.Divider that only applies when gap="none"

Rollout strategy

• Patch release

Testing & Reviewing

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
• (GitHub staff only) Integration tests pass at github/github (Learn more about how to run integration tests)

[changeset-bot]

🦋 Changeset detected

Latest commit: c70eeaf

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@primer/react	Patch

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[github-actions]

👋 Hi, this pull request contains changes to the source code that github/github-ui depends on. If you are GitHub staff, test these changes with github/github-ui using the integration workflow. Or, apply the integration-tests: skipped manually label to skip these checks.

[Copilot]

Pull Request Overview

This PR fixes a spacing issue in the ActionBar component by adding conditional horizontal padding to the Divider when gap="none" is set. The fix ensures that dividers maintain appropriate spacing even when no gap is applied between ActionBar items.

Key Changes

• Added 8px horizontal padding to ActionBar.Divider that only applies when gap="none"
• Used CSS nesting to conditionally apply styles based on the data-gap attribute
• Added changeset for patch release

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/react/src/ActionBar/ActionBar.module.css	Added nested .Divider selector within gap="none" block to apply 8px horizontal padding using --base-size-8 design token
.changeset/mean-facts-brush.md	Added changeset documenting the patch fix for ActionBar Divider spacing

[hectahertz]

Good fix ✨

[primer-integration]

😢 Hi from github/github-ui. The integration workflow has failed: https://github.com/github/github-ui/actions/runs/19577160518