fix completion after dot-keyword - fixes #23882

pkg/analysis_server/test/services/completion/completion_target_test.dart

Index: pkg/analysis_server/test/services/completion/completion_target_test.dart
diff --git a/pkg/analysis_server/test/services/completion/completion_target_test.dart b/pkg/analysis_server/test/services/completion/completion_target_test.dart
index f563dfdb96c6dd4822930efec3c62421a0c7fdc6..35bd5dafbc21d4139bc50a86963c309e9ae73cda 100644
--- a/pkg/analysis_server/test/services/completion/completion_target_test.dart
+++ b/pkg/analysis_server/test/services/completion/completion_target_test.dart
@@ -139,6 +139,16 @@ class CompletionTargetTest extends AbstractContextTest {
     assertTarget('}', '{}');
   }
 
+  test_Block_keyword() {
+    addTestSource('class C { static C get instance => null; } main() {C.in^}');
+    assertTarget('in', 'C.in');
+  }
+
+  test_Block_keyword2() {
+    addTestSource('class C { static C get instance => null; } main() {C.i^n}');
+    assertTarget('in', 'C.in');
+  }
+
   test_FormalParameter_partialType() {
     // SimpleIdentifier  PrefixedIdentifier  TypeName
     addTestSource('foo(b.^ f) { }');