Wrong syntax highlighting for Groovy GStrings when interpolating values

[FranzMartyn]

I am coming from this codewars issue , which uses codemirror 5 for it's editor.

Sometimes, codewars' editor gets the syntax highlighting for GStrings wrong when they contain interpolated values.

Codewars' editor does this:

instead of this (example from Intellij Idea):

But the syntax highlighting on codewars' editor works when adding curly braces:

[FranzMartyn]

It seems to display how it should when a character, that is neither a letter, nor a digit, nor whitespace, comes after the interpolated value

[marijnh]

Attached patch should help.