Don't reuse LSP error code that triggers shutdown for refactor errors

Bug: #42573
Change-Id: I615563ed636cf48b4fe84e7588f49bb7137a4f53
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/153341
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Danny Tuppeny <danny@tuppeny.com>

Author: DanTup

pkg/analysis_server/lib/src/lsp/constants.dart

@@ -104,5 +104,5 @@ abstract class ServerErrorCodes {
   ///   restart the server. However clients should be careful to not restart a
   ///   crashing server endlessly. VS Code for example doesn't restart a server
   ///   if it crashes 5 times in the last 180 seconds."
-  static const ClientServerInconsistentState = ErrorCodes(-32010);
+  static const ClientServerInconsistentState = ErrorCodes(-32099);
 }

pkg/analysis_server/test/lsp/rename_test.dart

@@ -248,6 +248,16 @@ class RenameTest extends AbstractLspAnalysisServerTest {
     expect(error.message, contains('already declares class with name'));
   }
 
+  Future<void> test_rename_rejectedForSameName() async {
+    const content = '''
+    class My^Class {}
+    ''';
+    final error = await _test_rename_failure(content, 'MyClass');
+    expect(error.code, equals(ServerErrorCodes.RenameNotValid));
+    expect(error.message,
+        contains('new name must be different than the current name'));
+  }
+
   Future<void> test_rename_rejectedForStaleDocument() async {
     const content = '''
     class MyClass {}
@@ -259,6 +269,22 @@ class RenameTest extends AbstractLspAnalysisServerTest {
     expect(error.message, contains('Document was modified'));
   }
 
+  Future<void> test_rename_rejectionsDoNotCrashServer() async {
+    // Checks that a rename failure does not stop the server from responding
+    // as was previously the case in https://github.com/dart-lang/sdk/issues/42573
+    // because the error code was duplicated/reused for ClientServerInconsistentState.
+    const content = '''
+    /// Test Class
+    class My^Class {}
+    ''';
+    final error = await _test_rename_failure(content, 'MyClass');
+    expect(error.code, isNotNull);
+
+    // Send any other request to ensure the server is still responsive.
+    final hover = await getHover(mainFileUri, positionFromMarker(content));
+    expect(hover?.contents, isNotNull);
+  }
+
   Future<void> test_rename_sdkClass() async {
     const content = '''
     final a = new [[Ob^ject]]();