Fix distinction between 'this' and 'base' in generic classes.

ICSharpCode.Decompiler/Ast/AstMethodBodyBuilder.cs

@@ -638,7 +638,7 @@ namespace Decompiler
 			}
 			if (target is ThisReferenceExpression && !isVirtual) {
 				// a non-virtual call on "this" might be a "base"-call.
-				if (cecilMethod.DeclaringType != methodDef.DeclaringType) {
+				if ((cecilMethod.DeclaringType.IsGenericInstance ? cecilMethod.DeclaringType.GetElementType() : cecilMethod.DeclaringType) != methodDef.DeclaringType) {
 					// If we're not calling a method in the current class; we must be calling one in the base class.
 					target = new BaseReferenceExpression();
 				}

ICSharpCode.Decompiler/Tests/Generics.cs

@@ -0,0 +1,30 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under MIT X11 license (for details please see \doc\license.txt)
+
+using System;
+
+public static class Generics
+{
+	class MyArray<T>
+	{
+		private T[] arr;
+		
+		public MyArray(int capacity)
+		{
+			this.arr = new T[capacity];
+		}
+		
+		public void Size(int capacity)
+		{
+			Array.Resize(ref this.arr, capacity);
+		}
+		
+		public void Grow(int capacity)
+		{
+			if (capacity >= this.arr.Length)
+			{
+				this.Size(capacity);
+			}
+		}
+	}
+}

ICSharpCode.Decompiler/Tests/ICSharpCode.Decompiler.Tests.csproj

@@ -51,6 +51,7 @@
     <Compile Include="ArrayInitializers.cs" />
     <Compile Include="DelegateConstruction.cs" />
     <Compile Include="ExceptionHandling.cs" />
+    <Compile Include="Generics.cs" />
     <Compile Include="MultidimensionalArray.cs" />
     <Compile Include="Loops.cs" />
     <Compile Include="PropertiesAndEvents.cs" />