Add pretty tests for virtual, interface, and struct auto-properties

Virtual/override/sealed-override auto-properties, implicit and
explicit interface implementations, asymmetric accessor
accessibility, and auto-properties in structs were not covered.

Assisted-by: Claude:claude-fable-5:Claude Code

ICSharpCode.Decompiler.Tests/TestCases/Pretty/AutoProperties.cs

@@ -2,6 +2,12 @@ using System;
 
 namespace ICSharpCode.Decompiler.Tests.TestCases.Pretty
 {
+	internal class AsymmetricAccessibility
+	{
+		public int PrivateSetter { get; private set; }
+
+		public int ProtectedSetter { get; protected set; }
+	}
 	internal class AutoProperties
 	{
 #if CS110
@@ -38,10 +44,40 @@ namespace ICSharpCode.Decompiler.Tests.TestCases.Pretty
 #endif
 		}
 	}
+	internal class AutoPropertiesBase
+	{
+		public virtual int VirtualProperty { get; set; }
+
+		public virtual int VirtualGetterOnly { get; }
+	}
+	internal class AutoPropertiesDerived : AutoPropertiesBase
+	{
+		public override int VirtualProperty { get; set; }
+
+		public sealed override int VirtualGetterOnly { get; }
+	}
+	internal class AutoPropertyExplicitImpl : IAutoProperty
+	{
+		int IAutoProperty.Property { get; set; }
+	}
+	internal class AutoPropertyImplicitImpl : IAutoProperty
+	{
+		public int Property { get; set; }
+	}
+	internal interface IAutoProperty
+	{
+		int Property { get; set; }
+	}
 #if !NET70
 	[AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Property | AttributeTargets.Field, AllowMultiple = false, Inherited = false)]
 	internal sealed class RequiredMemberAttribute : Attribute
 	{
 	}
 #endif
+	internal struct StructAutoProperties
+	{
+		public int Property { get; set; }
+
+		public int GetterOnly { get; }
+	}
 }