[Resolver] Give the value parameter a domregion close to the setter or adder.

Previously the value parameters were given the start and end location (0, 0) which was problematic for the
FindReferences class which uses this information to decide if two variables are the same when finding references.

ICSharpCode.NRefactory.CSharp/Resolver/ResolveVisitor.cs

@@ -855,7 +855,11 @@ namespace ICSharpCode.NRefactory.CSharp.Resolver
 				for (AstNode node = propertyOrIndexerDeclaration.FirstChild; node != null; node = node.NextSibling) {
 					if (node.Role == PropertyDeclaration.SetterRole && member != null) {
 						resolver = resolver.PushBlock();
-						resolver = resolver.AddVariable(new DefaultParameter(member.ReturnType, "value"));
+						var setter = node as Accessor;
+						var setterRegion = setter.Body.GetRegion();
+						var valueRegion = new DomRegion(setterRegion.BeginLine, setterRegion.BeginColumn,
+						                                setterRegion.BeginLine, setterRegion.BeginColumn);
+						resolver = resolver.AddVariable(new DefaultParameter(member.ReturnType, "value", valueRegion));
 						Scan(node);
 						resolver = resolver.PopBlock();
 					} else {
@@ -902,7 +906,10 @@ namespace ICSharpCode.NRefactory.CSharp.Resolver
 				
 				if (member != null) {
 					resolver = resolver.PushBlock();
-					resolver = resolver.AddVariable(new DefaultParameter(member.ReturnType, "value"));
+					var adderRegion = eventDeclaration.AddAccessor.Body.GetRegion();
+					var valueRegion = new DomRegion(adderRegion.BeginLine, adderRegion.BeginColumn,
+					                                adderRegion.BeginLine, adderRegion.BeginColumn);
+					resolver = resolver.AddVariable(new DefaultParameter(member.ReturnType, "value", valueRegion));
 					ScanChildren(eventDeclaration);
 				} else {
 					ScanChildren(eventDeclaration);

ICSharpCode.NRefactory.Tests/CSharp/Resolver/NameLookupTests.cs

@@ -295,6 +295,7 @@ class Color {
 			LocalResolveResult result = Resolve<LocalResolveResult>(program);
 			Assert.AreEqual("System.String", result.Type.FullName);
 			Assert.AreEqual("value", result.Variable.Name);
+			Assert.AreEqual(new DomRegion(3, 7, 3, 7), result.Variable.Region);
 		}
 		
 		[Test]
@@ -312,6 +313,7 @@ class Color {
 			LocalResolveResult result = Resolve<LocalResolveResult>(program);
 			Assert.AreEqual("System.EventHandler", result.Type.FullName);
 			Assert.AreEqual("value", result.Variable.Name);
+			Assert.AreEqual(new DomRegion(3, 7, 3, 7), result.Variable.Region);
 		}
 		
 		[Test]
@@ -328,6 +330,7 @@ class Color {
 			LocalResolveResult result = Resolve<LocalResolveResult>(program);
 			Assert.AreEqual("System.String", result.Type.FullName);
 			Assert.AreEqual("value", result.Variable.Name);
+			Assert.AreEqual(new DomRegion(3, 7, 3, 7), result.Variable.Region);
 		}
 		
 		[Test]