fix(syntax): include padding with background color override

[TomJGooding]

Type of changes

• [x] Bug fix
• [ ] New feature
• [ ] Documentation / docstrings
• [ ] Tests
• [ ] Other

Checklist

• [x] I've run the latest black with default args on new code.
• [x] I've updated CHANGELOG.md and CONTRIBUTORS.md where appropriate.
• [x] I've added tests for new code.
• [x] I accept that @willmcgugan may be pedantic in the code review.

Description

Fixes #3295. I've tested manually but I'm afraid not sure how to add a proper test for this.

Before:

After:

[TomJGooding]

I've now added a test based on the others, where I assume you just copy paste the result from print(repr(result)) and then check that? (If Will has actually written these by hand I'm seriously impressed!)

If that's not the proper way to test this, please let me know!