Add annotation based Formatter overload in CodeStyle layer that is used by the...

Add annotation based Formatter overload in CodeStyle layer that is used by the code fixer - it is an internal Formatter API in Workspaces layer

src/CodeStyle/Core/Analyzers/Formatting/FormatterHelper.cs

@@ -10,6 +10,7 @@
 using Microsoft.CodeAnalysis.Text;
 using Roslyn.Utilities;
 using OptionSet = Microsoft.CodeAnalysis.Diagnostics.AnalyzerConfigOptions;
+using static Microsoft.CodeAnalysis.Formatting.FormattingExtensions;
 
 namespace Microsoft.CodeAnalysis.Formatting
 {
@@ -77,6 +78,23 @@ internal static async Task<SyntaxTree> FormatAsync(SyntaxTree syntaxTree, ISynta
         public static SyntaxNode Format(SyntaxNode node, ISyntaxFormattingService syntaxFormattingService, OptionSet options, CancellationToken cancellationToken)
             => Format(node, syntaxFormattingService, SpecializedCollections.SingletonEnumerable(node.FullSpan), options, rules: null, cancellationToken: cancellationToken);
 
+        /// <summary>
+        /// Formats the whitespace of a syntax tree.
+        /// </summary>
+        /// <param name="node">The root node of a syntax tree.</param>
+        /// <param name="annotation">The descendant nodes of the root to format.</param>
+        /// <param name="options">An optional set of formatting options. If these options are not supplied the current set of options from the workspace will be used.</param>
+        /// <param name="cancellationToken">An optional cancellation token.</param>
+        /// <returns>The formatted tree's root node.</returns>
+        public static SyntaxNode Format(SyntaxNode node, ISyntaxFormattingService syntaxFormattingService, SyntaxAnnotation annotation, OptionSet options, IEnumerable<AbstractFormattingRule> rules, CancellationToken cancellationToken)
+        {
+            var spans = (annotation == SyntaxAnnotation.ElasticAnnotation)
+                ? GetElasticSpans(node)
+                : GetAnnotatedSpans(node, annotation);
+
+            return Format(node, syntaxFormattingService, spans, options, rules, cancellationToken: cancellationToken);
+        }
+
         internal static SyntaxNode Format(SyntaxNode node, ISyntaxFormattingService syntaxFormattingService, IEnumerable<TextSpan> spans, OptionSet options, IEnumerable<AbstractFormattingRule> rules, CancellationToken cancellationToken)
         {
             var formattingResult = GetFormattingResult(node, syntaxFormattingService, spans, options, rules, cancellationToken);