RCS1262 CodeFix doesn't take into account repeated $ characters in interpolated raw strings

[prettybits]

Product and Version Used: Roslynator.Analyzers v4.7.0

Steps to Reproduce: Define a string variable as an interpolated raw string using 2 or more $ characters in front, with a corresponding number of curly braces around the interpolation expressions, e.g.

var interpolatedRaw = $$"""{{someVariable}}{@m}""";

This is correctly detected as not needing to be a raw string, but the CodeFix produces invalid code:

Actual Behavior:

var interpolatedRaw = $"{{someVariable}}{@m}";

Expected Behavior:

var interpolatedRaw = $"{someVariable}{{@m}}";

I'm creating these kinds of strings for ExpressionTemplates of Serilog.Expressions, and using interpolated raw strings was how I had specified these so far.