• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Proposed changes

As discussed in the forums, the fade effect for tab labels that overflow was mistakenly removed in #5510. This PR fixes that.

Additionally, the ugly SCSS variables I added in #3692 were removed, and the changes made to the linear gradients in 'tabs.scss' in 233a199 were reverted. They were introduced as a workaround for a Safari issue that has already been resolved.

From Safari 15.4 Release Notes - March 14, 2022

Fixed gradient color interpolation for colors with alpha transparency.

Editor screenshots with the fix:

	Vanilla	Dark (Midnight)
Chrome
Firefox
Safari

Checklist

• I have read the contribution guidelines
• For non-bugfix PRs, I have discussed this change on the forum/slack team.
• I have run npm run test to verify the unit tests pass
• I have added suitable unit tests to cover the new/changed functionality