preceding slash space breaks shell variable name highlighting

[wesinator]

Prerequisites

• Put an X between the brackets on this line if you have done all of the following:
  • Reproduced the problem in Safe Mode: http://flight-manual.atom.io/hacking-atom/sections/debugging/#using-safe-mode
  • Followed all applicable steps in the debugging guide: http://flight-manual.atom.io/hacking-atom/sections/debugging/
  • Checked the FAQs on the message board for common solutions: https://discuss.atom.io/c/faq
  • Checked that your issue isn't already filed: https://github.com/issues?utf8=✓&q=is%3Aissue+user%3Aatom
  • Checked that there is not already an Atom package that provides the described functionality: https://atom.io/packages

Description

Phrase with slash escaped spaces preceding var use breaks the highlighting on the var name.

Steps to Reproduce

echo test\ file_$DATE.txt
echo test file_$DATE.txt

Expected behavior: DATE highlighted as var in both cases

Actual behavior: words with preceding slash escaped spaces cause var name following $ to not be highlighted.

Reproduces how often: always

Versions

macOS
atom 1.35.1
0.27.9

[rsese]

Thanks @wesinator 👍 Reproduced with 1.35.1 on macOS 10.12.6.