Change field to property

Author: davidwengier

src/EditorFeatures/Core.Cocoa/Snippets/AbstractSnippetExpansionClient.cs

@@ -34,7 +34,7 @@ internal abstract class AbstractSnippetExpansionClient : ForegroundThreadAffinit
         protected int _indentDepth;
         protected bool _earlyEndExpansionHappened;
 
-        internal IExpansionSession? ExpansionSession;
+        public IExpansionSession? ExpansionSession { get; private set; }
 
         public AbstractSnippetExpansionClient(IThreadingContext threadingContext, IContentType languageServiceGuid, ITextView textView, ITextBuffer subjectBuffer, IExpansionServiceProvider expansionServiceProvider)
             : base(threadingContext)