Added threading assertions

src/EditorFeatures/Core.Wpf/InlineParameterNameHints/InlineParameterNameHintsTagger.cs

@@ -6,6 +6,7 @@
 
 using System;
 using System.Collections.Generic;
+using Microsoft.CodeAnalysis.Editor.Shared.Utilities;
 using Microsoft.VisualStudio.Text;
 using Microsoft.VisualStudio.Text.Classification;
 using Microsoft.VisualStudio.Text.Editor;
@@ -38,12 +39,14 @@ internal sealed class InlineParameterNameHintsTagger : ITagger<IntraTextAdornmen
         private readonly IClassificationFormatMap _formatMap;
         private TextFormattingRunProperties? _format;
         private readonly IClassificationType _hint;
+        private readonly ForegroundThreadAffinitizedObject _threadAffinitizedObject;
 
         public event EventHandler<SnapshotSpanEventArgs>? TagsChanged;
 
         public InlineParameterNameHintsTagger(InlineParameterNameHintsTaggerProvider taggerProvider, ITextView textView, ITextBuffer buffer, ITagAggregator<InlineParameterNameHintDataTag> tagAggregator)
         {
             _cache = new List<ITagSpan<IntraTextAdornmentTag>>();
+            _threadAffinitizedObject = new ForegroundThreadAffinitizedObject(taggerProvider.ThreadingContext);
             _textView = textView;
             _buffer = buffer;
             _tagAggregator = tagAggregator;
@@ -55,6 +58,7 @@ public InlineParameterNameHintsTagger(InlineParameterNameHintsTaggerProvider tag
 
         private void OnClassificationFormatMappingChanged(object sender, EventArgs e)
         {
+            _threadAffinitizedObject.AssertIsForeground();
             if (_format != null)
             {
                 _format = null;
@@ -76,8 +80,8 @@ private TextFormattingRunProperties Format
         {
             get
             {
+                _threadAffinitizedObject.AssertIsForeground();
                 _format ??= _formatMap.GetTextProperties(_hint);
-
                 return _format;
             }
         }

src/EditorFeatures/Core.Wpf/InlineParameterNameHints/InlineParameterNameHintsTaggerProvider.cs

@@ -4,6 +4,7 @@
 
 using System;
 using System.ComponentModel.Composition;
+using Microsoft.CodeAnalysis.Editor.Shared.Utilities;
 using Microsoft.CodeAnalysis.Host.Mef;
 using Microsoft.VisualStudio.Text;
 using Microsoft.VisualStudio.Text.Classification;
@@ -26,18 +27,22 @@ internal class InlineParameterNameHintsTaggerProvider : IViewTaggerProvider
         private readonly IBufferTagAggregatorFactoryService _bufferTagAggregatorFactoryService;
         public readonly IClassificationFormatMapService ClassificationFormatMapService;
         public readonly IClassificationTypeRegistryService ClassificationTypeRegistryService;
+        public readonly IThreadingContext ThreadingContext;
 
         [ImportingConstructor]
         [Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
         public InlineParameterNameHintsTaggerProvider(IBufferTagAggregatorFactoryService bufferTagAggregatorFactoryService,
-                                                      IClassificationFormatMapService classificationFormatMapService,
-                                                      IClassificationTypeRegistryService classificationTypeRegistryService)
+                                                       IClassificationFormatMapService classificationFormatMapService,
+                                                       IClassificationTypeRegistryService classificationTypeRegistryService,
+                                                       IThreadingContext threadingContext)
         {
             _bufferTagAggregatorFactoryService = bufferTagAggregatorFactoryService;
             this.ClassificationFormatMapService = classificationFormatMapService;
             this.ClassificationTypeRegistryService = classificationTypeRegistryService;
+            this.ThreadingContext = threadingContext;
         }
 
+
         public ITagger<T> CreateTagger<T>(ITextView textView, ITextBuffer buffer) where T : ITag
         {
             var tagAggregator = _bufferTagAggregatorFactoryService.CreateTagAggregator<InlineParameterNameHintDataTag>(buffer);