[DAS] Fixes 'Import from' assist to display the existing uri

Fixes: https://github.com/dart-lang/sdk/issues/61417
Change-Id: Ibf545096c8240093ad58ec2a69bc1b159cb85fc9
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/447081
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Auto-Submit: Felipe Morschel <git@fmorschel.dev>
Reviewed-by: Samuel Rawlins <srawlins@google.com>
Commit-Queue: Brian Wilkerson <brianwilkerson@google.com>

pkg/analysis_server/lib/src/services/correction/dart/import_library.dart

diff --git a/pkg/analysis_server/lib/src/services/correction/dart/import_library.dart b/pkg/analysis_server/lib/src/services/correction/dart/import_library.dart
index a135e49..02d87d0 100644
--- a/pkg/analysis_server/lib/src/services/correction/dart/import_library.dart
+++ b/pkg/analysis_server/lib/src/services/correction/dart/import_library.dart
@@ -179,8 +179,10 @@
       ];
     }
     var codeStyleOptions = getCodeStyleOptions(unitResult.file);
-    if (codeStyleOptions.usePackageUris) {
-      return [
+    var usePackageUris = codeStyleOptions.usePackageUris;
+    var useRelativeUris = codeStyleOptions.useRelativeUris;
+    return [
+      if (usePackageUris || !useRelativeUris) ...[
         _ImportAbsoluteLibrary(fixKind, library, prefix, context: context),
         _ImportAbsoluteLibrary(
           fixKindShow,
@@ -189,10 +191,8 @@
           show: name,
           context: context,
         ),
-      ];
-    }
-    if (codeStyleOptions.useRelativeUris) {
-      return [
+      ],
+      if (useRelativeUris || !usePackageUris) ...[
         _ImportRelativeLibrary(fixKind, library, prefix, context: context),
         _ImportRelativeLibrary(
           fixKindShow,
@@ -201,25 +201,7 @@
           show: name,
           context: context,
         ),
-      ];
-    }
-    return [
-      _ImportAbsoluteLibrary(fixKind, library, prefix, context: context),
-      _ImportAbsoluteLibrary(
-        fixKindShow,
-        library,
-        prefix,
-        show: name,
-        context: context,
-      ),
-      _ImportRelativeLibrary(fixKind, library, prefix, context: context),
-      _ImportRelativeLibrary(
-        fixKindShow,
-        library,
-        prefix,
-        show: name,
-        context: context,
-      ),
+      ],
     ];
   }
 
@@ -237,8 +219,13 @@
     // Maybe there is an existing import, but it is with prefix and we don't use
     // this prefix.
     var alreadyImportedWithPrefix = <LibraryElement>{};
-    for (var import in unitResult.libraryFragment.libraryImports) {
+    for (var importDirective
+        in unitResult.unit.directives.whereType<ImportDirective>()) {
       // Prepare the element.
+      var import = importDirective.libraryImport;
+      if (import == null) {
+        continue;
+      }
       var libraryElement = import.importedLibrary;
       if (libraryElement == null) {
         continue;
@@ -260,7 +247,7 @@
       ) = await _importEditCombinators(
         import,
         libraryElement,
-        libraryElement.uri.toString(),
+        importDirective.uri.stringValue!,
         name,
         prefix: prefix,
       );

pkg/analysis_server/test/src/services/correction/fix/import_library_hide_test.dart

diff --git a/pkg/analysis_server/test/src/services/correction/fix/import_library_hide_test.dart b/pkg/analysis_server/test/src/services/correction/fix/import_library_hide_test.dart
index f98bd4f..0b41bb1 100644
--- a/pkg/analysis_server/test/src/services/correction/fix/import_library_hide_test.dart
+++ b/pkg/analysis_server/test/src/services/correction/fix/import_library_hide_test.dart
@@ -554,6 +554,29 @@
 ''');
   }
 
+  Future<void> test_relativeImport() async {
+    newFile('$testPackageLibPath/lib.dart', '''
+class C {}
+extension E on String {
+  void m() {}
+}
+''');
+    await resolveTestCode('''
+import 'lib.dart' as lib hide E;
+
+void f(String s, lib.C c) {
+  s.m();
+}
+''');
+    await assertHasFix('''
+import 'lib.dart' as lib;
+
+void f(String s, lib.C c) {
+  s.m();
+}
+''', matchFixMessage: "Import 'E' from lib.dart");
+  }
+
   Future<void> test_static_samePackage() async {
     newFile('$testPackageLibPath/lib.dart', '''
 class A {}

pkg/analysis_server/test/src/services/correction/fix/import_library_show_test.dart

diff --git a/pkg/analysis_server/test/src/services/correction/fix/import_library_show_test.dart b/pkg/analysis_server/test/src/services/correction/fix/import_library_show_test.dart
index 202cb71..d64e4b8 100644
--- a/pkg/analysis_server/test/src/services/correction/fix/import_library_show_test.dart
+++ b/pkg/analysis_server/test/src/services/correction/fix/import_library_show_test.dart
@@ -502,6 +502,29 @@
 ''');
   }
 
+  Future<void> test_relativeImport() async {
+    newFile('$testPackageLibPath/lib.dart', '''
+class C {}
+extension E on String {
+  void m() {}
+}
+''');
+    await resolveTestCode('''
+import 'lib.dart' as lib show C;
+
+void f(String s, lib.C c) {
+  s.m();
+}
+''');
+    await assertHasFix('''
+import 'lib.dart' as lib show C, E;
+
+void f(String s, lib.C c) {
+  s.m();
+}
+''', matchFixMessage: "Import 'E' from lib.dart");
+  }
+
   Future<void> test_sdk() async {
     await resolveTestCode(r'''
 import 'dart:collection' show HashMap;