[CodeActions] Fix bugs in ConvertToInitializer.

ICSharpCode.NRefactory.CSharp/Refactoring/CodeActions/ConvertToInitializer/StatementsToInitializerConverter.cs

@@ -159,7 +159,9 @@ namespace ICSharpCode.NRefactory.CSharp.Refactoring
 					var initializerPath = InitializerPath.FromResolveResult(argumentLocalResolveResult);
 					if (initializerPath == null || !initializers.ContainsKey(initializerPath))
 						return false;
-					tuple.Elements.Add(initializers[initializerPath]);
+					// Add a clone, since we do not yet know if this is where the initializer will be used
+					var initializerClone = initializers[initializerPath].Clone();
+					tuple.Elements.Add(initializerClone);
 				} else {
 					tuple.Elements.Add(argument.Clone());
 				}
@@ -167,6 +169,8 @@ namespace ICSharpCode.NRefactory.CSharp.Refactoring
 			ReplacementNodeHelper.AddReplacementAnnotation(tuple, expressionStatement);
 
 			var targetPath = InitializerPath.FromResolveResult(targetResult);
+			if (targetPath == null || !initializers.ContainsKey(targetPath))
+				return false;
 			InsertImplicitInitializersForPath(targetPath);
 			var targetInitializer = initializers [targetPath];
 			AddToInitializer(targetInitializer, tuple);
@@ -196,13 +200,15 @@ namespace ICSharpCode.NRefactory.CSharp.Refactoring
 			var rightResolveResult = context.Resolve(initializer) as LocalResolveResult;
 			if (rightResolveResult != null) {
 				var rightPath = InitializerPath.FromResolveResult(rightResolveResult);
+				if (rightPath != null && initializers.ContainsKey(rightPath)) {
 					var rightInitializer = initializers [rightPath];
-				if (rightInitializer != null) {
-					rightInitializer.AddAnnotation(new ReplacementNodeAnnotation() { ReplacedNode = node });
+					ReplacementNodeHelper.AddReplacementAnnotation(rightInitializer, node);
 					initializers.Remove(rightPath);
 					initializers [variablePath] = rightInitializer;
+					if (rightPath == mainInitializerPath) {
 						mainInitializerPath = variablePath;
 					}
+				}
 			} else {
 				initializers [variablePath] = ReplacementNodeHelper.CloneWithReplacementAnnotation(initializer, node);
 			}
@@ -223,7 +229,6 @@ namespace ICSharpCode.NRefactory.CSharp.Refactoring
 		{
 			var rightResolveResult = context.Resolve(right) as LocalResolveResult;
 			var leftResolveResult = context.Resolve(left);
-			var leftPath = InitializerPath.FromResolveResult(leftResolveResult);
 			Expression initializer;
 			if (rightResolveResult != null) {
 				var rightPath = InitializerPath.FromResolveResult(rightResolveResult);
@@ -235,6 +240,10 @@ namespace ICSharpCode.NRefactory.CSharp.Refactoring
 			} else {
 				initializer = right.Clone();
 			}
+			var leftPath = InitializerPath.FromResolveResult(leftResolveResult);
+			if (leftPath == null) {
+				return false;
+			}
 			// Move replacement annotations over, in case this is the second assignment
 			// to the same variable.
 			AddOldAnnotationsToInitializer(leftPath, initializer);

ICSharpCode.NRefactory.Tests/CSharp/CodeActions/ConvertToInitializer/ConvertToInitializerTests.cs

@@ -152,6 +152,25 @@ class TestClass
 }");
 		}
 		
+		[Test]
+		public void UnknownTargetForAdd()
+		{
+			Test<ConvertToInitializerAction>(baseText + @"
+		var collection = new System.Collections.Generic.List<string> ();
+		var item $= new TestClass ();
+		item.Property = ""Value1"";
+		collection.Add(item);
+	}
+}", baseText + @"
+		var collection = new System.Collections.Generic.List<string> ();
+		var item = new TestClass() {
+			Property = ""Value1""
+		};
+		collection.Add(item);
+	}
+}");
+		}
+
 		[Test]
 		public void ObjectContainingCollections()
 		{
@@ -479,8 +498,7 @@ class TestClass
 			Nested = new TestClass()
 		};
 	}
-}"
-			);
+}");
 		}
 		
 		[Test]
@@ -496,8 +514,26 @@ class TestClass
 			Property = ""Value""
 		};
 	}
-}"
-			);
+}");
+		}
+		
+		[Test]
+		public void FinalVariableAssignmentOfOtherInitializer()
+		{
+			Test<ConvertToInitializerAction>(baseText + @"
+		var tc $= new TestClass ();
+		tc.Property = ""Value"";
+		var _variable = new TestClass ();
+		var variable = _variable;
+	}
+}", baseText + @"
+		var tc = new TestClass () {
+			Property = ""Value""
+		};
+		var _variable = new Test$Class ();
+		var variable = _variable;
+	}
+}");
 		}
 
 		[Test]