Correctly reimplement #177

[ivanpu]

atom#177 does not do what you want: str1 || str2 returns str1 if not empty, str2 otherwise

Requirements

• Filling out the template is required. Any pull request that does not include enough information to be reviewed in a timely manner may be closed at the maintainers' discretion.
• All new code requires tests to ensure against regressions

Description of the Change

A fix for atom#185, by rewriting the atom#177.

Alternate Designs

['source.gfm', 'text.md'].includes(grammarScopeName)

Benefits

No more whitespace stripping in Markdown.

Possible Drawbacks

None?

Applicable Issues

atom#185, atom#186, atom#177

[ivanpu]

A note: after submitting this, I see that there's already atom#186 (that I accidentally linked to instead of atom#185).
So decision is your which PR to use.

[ivanpu]

Oops... went to the wrong repo?

[burodepeper]

Yup, wrong repo ;)