add completion after export - fixes #24400

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

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library test.services.completion.contributor.dart.importuri;
 
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/services/completion/dart_completion_manager.dart';
 import 'package:analysis_server/src/services/completion/uri_contributor.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
@@ skipping 168 matching lines @@
   test_import_package2() {
     addPackageSource('foo', 'foo.dart', 'library foo;');
     addPackageSource('foo', 'baz/too.dart', 'library too;');
     addPackageSource('bar', 'bar.dart', 'library bar;');
     addTestSource('import "package:foo/baz/^" import');
     computeFast();
     assertSuggest('package:foo/baz/too.dart',
         csKind: CompletionSuggestionKind.IMPORT);
   }
 
+  test_export_package2() {
+    addPackageSource('foo', 'foo.dart', 'library foo;');
+    addPackageSource('foo', 'baz/too.dart', 'library too;');
+    addPackageSource('bar', 'bar.dart', 'library bar;');
+    addTestSource('export "package:foo/baz/^" import');
+    computeFast();
+    assertSuggest('package:foo/baz/too.dart',
+        csKind: CompletionSuggestionKind.IMPORT);
+  }
+
   test_import_package_missing_lib() {
     var pkgSrc = addPackageSource('bar', 'bar.dart', 'library bar;');
     provider.deleteFolder(dirname(pkgSrc.fullName));
     addTestSource('import "p^" class');
     computeFast();
     expect(request.replacementOffset, completionOffset - 1);
     expect(request.replacementLength, 1);
     assertSuggest('package:', csKind: CompletionSuggestionKind.IMPORT);
     assertSuggest('package:bar/', csKind: CompletionSuggestionKind.IMPORT);
     assertNotSuggested('package:bar/bar.dart');
@@ skipping 247 matching lines @@
     assertNotSuggested('foo/');
     assertNotSuggested('foo/bar.dart');
     assertSuggest('../blat.dart', csKind: CompletionSuggestionKind.IMPORT);
   }
 }
 
 class _TestWinResourceProvider extends MemoryResourceProvider {
   @override
   Context get pathContext => windows;
 }