Incorrect syntax highlighting for rf strings #186

Environment data

• VS Code version: 1.36.0
• MagicPython version: 1.1.1
• OS: macOS 10.14.5
• Color scheme: Dark+ (default dark)
• Python version: 3.6.7 (miniconda)

Expected behavior

Combining raw strings and f-strings, I'd expect syntax highlighting inside curly brackets.

Actual behavior

But what I get is the uniform dark red color of raw strings.

Related

Issue was originally raised in microsoft/vscode-python#6572.