C#: Do not insert a synthetic ToString call, if a format or alignment option is specified in the string interpolation.

Author: michaelnebel

csharp/extractor/Semmle.Extraction.CSharp/Entities/Expressions/InterpolatedString.cs

@@ -20,7 +20,14 @@ protected override void PopulateExpression(TextWriter trapFile)
                 {
                     case SyntaxKind.Interpolation:
                         var interpolation = (InterpolationSyntax)c;
-                        ImplicitToString.Create(Context, interpolation.Expression, this, child++);
+                        if (interpolation.FormatClause is null && interpolation.AlignmentClause is null)
+                        {
+                            ImplicitToString.Create(Context, interpolation.Expression, this, child++);
+                        }
+                        else
+                        {
+                            Create(Context, interpolation.Expression, this, child++);
+                        }
                         break;
                     case SyntaxKind.InterpolatedStringText:
                         // Create a string literal