Fix local functions inside lambdas.

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

@@ -222,5 +222,17 @@ namespace LocalFunctions
 				}
 			}
 		}
+
+		public static int LocalFunctionInLambda(IEnumerable<int> xs)
+		{
+			return xs.First(delegate(int x) {
+				return Do();
+
+				bool Do()
+				{
+					return x == 3;
+				}
+			});
+		}
 	}
 }

ICSharpCode.Decompiler/IL/Transforms/LocalFunctionDecompiler.cs

@@ -169,6 +169,11 @@ namespace ICSharpCode.Decompiler.IL.Transforms
 				}
 			}
 
+			if (function.DeclarationScope != null && function.DeclarationScope.Parent is ILFunction betterParentFunction) {
+				parentFunction.LocalFunctions.Remove(function);
+				betterParentFunction.LocalFunctions.Add(function);
+			}
+
 			return function;
 		}