Reanalyze on CodeStyleOptions changed

When a code style option is changed, it can change the set of
diagnostics or the severity of existing diagnostics. We now trigger
reanalysis when one of these options is changed.

src/Features/Core/Portable/Diagnostics/DiagnosticAnalyzerService_IncrementalAnalyzer.cs

@@ -5,6 +5,7 @@
 using System.Runtime.CompilerServices;
 using System.Threading;
 using System.Threading.Tasks;
+using Microsoft.CodeAnalysis.CodeStyle;
 using Microsoft.CodeAnalysis.Internal.Log;
 using Microsoft.CodeAnalysis.Options;
 using Microsoft.CodeAnalysis.Shared.Options;
@@ -128,6 +129,7 @@ public override void RemoveProject(ProjectId projectId)
             public override bool NeedsReanalysisOnOptionChanged(object sender, OptionChangedEventArgs e)
             {
                 return e.Option.Feature == nameof(SimplificationOptions) ||
+                       e.Option.Feature == nameof(CodeStyleOptions) ||
                        e.Option == ServiceFeatureOnOffOptions.ClosedFileDiagnostic ||
                        e.Option == RuntimeOptions.FullSolutionAnalysis ||
                        e.Option == InternalDiagnosticsOptions.UseDiagnosticEngineV2 ||

src/Workspaces/CSharp/Portable/CodeStyle/CSharpCodeStyleOptions.cs

@@ -8,19 +8,19 @@ namespace Microsoft.CodeAnalysis.CSharp.CodeStyle
     internal static class CSharpCodeStyleOptions
     {
         // TODO: get sign off on public api changes.
-        public static readonly Option<bool> UseVarWhenDeclaringLocals = new Option<bool>(nameof(CSharpCodeStyleOptions), nameof(UseVarWhenDeclaringLocals), defaultValue: true,
+        public static readonly Option<bool> UseVarWhenDeclaringLocals = new Option<bool>(nameof(CodeStyleOptions), nameof(UseVarWhenDeclaringLocals), defaultValue: true,
             storageLocations: new RoamingProfileStorageLocation("TextEditor.CSharp.Specific.UseVarWhenDeclaringLocals"));
 
-        public static readonly Option<CodeStyleOption<bool>> UseImplicitTypeForIntrinsicTypes = new Option<CodeStyleOption<bool>>(nameof(CSharpCodeStyleOptions), nameof(UseImplicitTypeForIntrinsicTypes), defaultValue: CodeStyleOption<bool>.Default,
+        public static readonly Option<CodeStyleOption<bool>> UseImplicitTypeForIntrinsicTypes = new Option<CodeStyleOption<bool>>(nameof(CodeStyleOptions), nameof(UseImplicitTypeForIntrinsicTypes), defaultValue: CodeStyleOption<bool>.Default,
             storageLocations: new RoamingProfileStorageLocation("TextEditor.CSharp.Specific.UseImplicitTypeForIntrinsicTypes"));
 
-        public static readonly Option<CodeStyleOption<bool>> UseImplicitTypeWhereApparent = new Option<CodeStyleOption<bool>>(nameof(CSharpCodeStyleOptions), nameof(UseImplicitTypeWhereApparent), defaultValue: CodeStyleOption<bool>.Default,
+        public static readonly Option<CodeStyleOption<bool>> UseImplicitTypeWhereApparent = new Option<CodeStyleOption<bool>>(nameof(CodeStyleOptions), nameof(UseImplicitTypeWhereApparent), defaultValue: CodeStyleOption<bool>.Default,
             storageLocations: new RoamingProfileStorageLocation("TextEditor.CSharp.Specific.UseImplicitTypeWhereApparent"));
 
-        public static readonly Option<CodeStyleOption<bool>> UseImplicitTypeWherePossible = new Option<CodeStyleOption<bool>>(nameof(CSharpCodeStyleOptions), nameof(UseImplicitTypeWherePossible), defaultValue: CodeStyleOption<bool>.Default,
+        public static readonly Option<CodeStyleOption<bool>> UseImplicitTypeWherePossible = new Option<CodeStyleOption<bool>>(nameof(CodeStyleOptions), nameof(UseImplicitTypeWherePossible), defaultValue: CodeStyleOption<bool>.Default,
             storageLocations: new RoamingProfileStorageLocation("TextEditor.CSharp.Specific.UseImplicitTypeWherePossible"));
 
-        public static readonly Option<CodeStyleOption<bool>> PreferConditionalDelegateCall = new Option<CodeStyleOption<bool>>(nameof(CSharpCodeStyleOptions), nameof(PreferConditionalDelegateCall), defaultValue: CodeStyleOptions.trueWithSuggestionEnforcement,
+        public static readonly Option<CodeStyleOption<bool>> PreferConditionalDelegateCall = new Option<CodeStyleOption<bool>>(nameof(CodeStyleOptions), nameof(PreferConditionalDelegateCall), defaultValue: CodeStyleOptions.trueWithSuggestionEnforcement,
             storageLocations: new RoamingProfileStorageLocation("TextEditor.CSharp.Specific.PreferConditionalDelegateCall"));
     }
 }