Make AnalyzerConfigOptions.Keys return an IEnumerable

src/Compilers/Core/Portable/DiagnosticAnalyzer/AnalyzerConfigOptions.cs

@@ -26,7 +26,7 @@ public abstract class AnalyzerConfigOptions
         /// <summary>
         /// Get the keys of the defined options.
         /// </summary>
-        public abstract ImmutableArray<string> Keys { get; }
+        public abstract IEnumerable<string> Keys { get; }
     }
 
     internal sealed class CompilerAnalyzerConfigOptions : AnalyzerConfigOptions
@@ -42,6 +42,6 @@ public CompilerAnalyzerConfigOptions(ImmutableDictionary<string, string> propert
 
         public override bool TryGetValue(string key, out string value) => _backing.TryGetValue(key, out value);
 
-        public override ImmutableArray<string> Keys => _backing.Keys.ToImmutableArray();
+        public override IEnumerable<string> Keys => _backing.Keys;
     }
 }

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

@@ -21,7 +21,7 @@ Microsoft.CodeAnalysis.SarifVersion.Latest = 2147483647 -> Microsoft.CodeAnalysi
 Microsoft.CodeAnalysis.SarifVersion.Sarif1 = 1 -> Microsoft.CodeAnalysis.SarifVersion
 Microsoft.CodeAnalysis.SarifVersion.Sarif2 = 2 -> Microsoft.CodeAnalysis.SarifVersion
 Microsoft.CodeAnalysis.SarifVersionFacts
-abstract Microsoft.CodeAnalysis.Diagnostics.AnalyzerConfigOptions.Keys.get -> System.Collections.Immutable.ImmutableArray<string>
+abstract Microsoft.CodeAnalysis.Diagnostics.AnalyzerConfigOptions.Keys.get -> System.Collections.Generic.IEnumerable<string>
 Microsoft.CodeAnalysis.SymbolDisplayMiscellaneousOptions.IncludeNotNullableReferenceTypeModifier = 256 -> Microsoft.CodeAnalysis.SymbolDisplayMiscellaneousOptions
 static Microsoft.CodeAnalysis.SarifVersionFacts.TryParse(string version, out Microsoft.CodeAnalysis.SarifVersion result) -> bool
 Microsoft.CodeAnalysis.IMethodSymbol.IsConditional.get -> bool

src/Workspaces/Core/Portable/Workspace/Solution/ProjectState.cs

@@ -318,7 +318,7 @@ public WorkspaceAnalyzerConfigOptions(AnalyzerConfigOptionsResult analyzerConfig
 
                 public override bool TryGetValue(string key, out string value) => _backing.TryGetValue(key, out value);
 
-                public override ImmutableArray<string> Keys => _backing.Keys.ToImmutableArray();
+                public override IEnumerable<string> Keys => _backing.Keys;
             }
         }