Map 'none' in .editorconfig to ReportDiagnostic.Suppress

Fixes #26972

src/Workspaces/Core/Portable/CodeStyle/CodeStyleHelpers.cs

@@ -95,6 +95,9 @@ public static bool TryParseNotification(string value, out NotificationOption not
             switch (value.Trim())
             {
                 case EditorConfigSeverityStrings.None:
+                    notification = NotificationOption.None;
+                    return true;
+
                 case EditorConfigSeverityStrings.Silent:
                     notification = NotificationOption.Silent;
                     return true;

src/Workspaces/Core/Portable/CodeStyle/NotificationOption.cs

@@ -29,6 +29,7 @@ public DiagnosticSeverity Value
             set => Severity = value.ToReportDiagnostic();
         }
 
+        public static readonly NotificationOption None = new NotificationOption(WorkspacesResources.None, ReportDiagnostic.Suppress);
         public static readonly NotificationOption Silent = new NotificationOption(WorkspacesResources.None, ReportDiagnostic.Hidden);
         public static readonly NotificationOption Suggestion = new NotificationOption(WorkspacesResources.Suggestion, ReportDiagnostic.Info);
         public static readonly NotificationOption Warning = new NotificationOption(WorkspacesResources.Warning, ReportDiagnostic.Warn);

src/Workspaces/Core/Portable/NamingStyles/EditorConfig/EditorConfigNamingStyleParser_NamingRule.cs

@@ -50,6 +50,8 @@ private static ReportDiagnostic ParseEnforcementLevel(string ruleSeverity)
             switch (ruleSeverity)
             {
                 case EditorConfigSeverityStrings.None:
+                    return ReportDiagnostic.Suppress;
+
                 case EditorConfigSeverityStrings.Silent:
                     return ReportDiagnostic.Hidden;
 

src/Workspaces/Core/Portable/PublicAPI.Unshipped.txt

-*REMOVED*static readonly Microsoft.CodeAnalysis.CodeStyle.NotificationOption.None -> Microsoft.CodeAnalysis.CodeStyle.NotificationOption
 Microsoft.CodeAnalysis.CodeStyle.NotificationOption.Severity.get -> Microsoft.CodeAnalysis.ReportDiagnostic
 Microsoft.CodeAnalysis.CodeStyle.NotificationOption.Severity.set -> void
 abstract Microsoft.CodeAnalysis.Editing.SyntaxGenerator.AliasImportDeclaration(string aliasIdentifierName, Microsoft.CodeAnalysis.SyntaxNode name) -> Microsoft.CodeAnalysis.SyntaxNode

src/Workspaces/CoreTest/CodeStyle/EditorConfigCodeStyleParserTests.cs

@@ -13,13 +13,13 @@ namespace Microsoft.CodeAnalysis.UnitTests.CodeStyle
     public class EditorConfigCodeStyleParserTests
     {
         [Theory]
-        [InlineData("true:none", true, ReportDiagnostic.Hidden)]
+        [InlineData("true:none", true, ReportDiagnostic.Suppress)]
         [InlineData("true:silent", true, ReportDiagnostic.Hidden)]
         [InlineData("true:suggestion", true, ReportDiagnostic.Info)]
         [InlineData("true:warning", true, ReportDiagnostic.Warn)]
         [InlineData("true:error", true, ReportDiagnostic.Error)]
         [InlineData("true", false, ReportDiagnostic.Hidden)]
-        [InlineData("false:none", false, ReportDiagnostic.Hidden)]
+        [InlineData("false:none", false, ReportDiagnostic.Suppress)]
         [InlineData("false:silent", false, ReportDiagnostic.Hidden)]
         [InlineData("false:suggestion", false, ReportDiagnostic.Info)]
         [InlineData("false:warning", false, ReportDiagnostic.Warn)]