Textmate grammar: prevent early termination of raw strings with hash (closes #6042)

[dustypomerleau]

Problematic sample code from #6042:

#[derive(Debug, Clone, Logos)]
enum Quoted<'source> {
    #[regex(r#"[^\\"']+"#)]
    Text(&'source str),
    #[token("\\")]
    StartEscape,
    #[token("\'", |_| Quote::Single)]
    #[token("\"", |_| Quote::Double)]
    End(Quote),

    #[error]
    Error,
}

Before fix:

After fix:

[matklad]

bors r+

[bors]

Build succeeded:

• Rust (macos-latest)
• Rust (ubuntu-latest)
• Rust (windows-latest)
• TypeScript (ubuntu-latest)
• TypeScript (windows-latest)

[matklad]

Seems like there are still some problems with strings:

(in this file: https://github.com/matklad/xshell/blob/ef3b40601bfd758ce290cc54168729536365eb20/tests/it.rs#L276)

I've noticed that this is pretty sever -- vscode classify code as string literals, which disables completion popup and probably many other featurs.

[matklad]

(I think I am running extension with this pathc applied, but tis better to doublehcekc)

[dustypomerleau]

I'm not at my machine, but it looks like that opening curly is starting an interpolation scope, which continues past the end of the string because there's no closing curly.

Will fix.