Prioritize analysis of files that import the changed file, or have an error or warning.

pkg/analyzer/test/src/dart/analysis/driver_test.dart

Index: pkg/analyzer/test/src/dart/analysis/driver_test.dart
diff --git a/pkg/analyzer/test/src/dart/analysis/driver_test.dart b/pkg/analyzer/test/src/dart/analysis/driver_test.dart
index 1bff4ea0def4bbe843ae3066eca4bf047826cebb..90b734f93b15c107ad547dfaaadf5f5dca5a6f1a 100644
--- a/pkg/analyzer/test/src/dart/analysis/driver_test.dart
+++ b/pkg/analyzer/test/src/dart/analysis/driver_test.dart
@@ -2179,6 +2179,72 @@ var A = B;
     allResults.clear();
   }
 
+  test_results_order() async {
+    var a = _p('/test/lib/a.dart');
+    var b = _p('/test/lib/b.dart');
+    var c = _p('/test/lib/c.dart');
+    var d = _p('/test/lib/d.dart');
+    var e = _p('/test/lib/e.dart');
+    var f = _p('/test/lib/f.dart');
+    provider.newFile(
+        a,
+        r'''
+import 'd.dart';
+''');
+    provider.newFile(b, '');
+    provider.newFile(
+        c,
+        r'''
+import 'd.dart';
+''');
+    provider.newFile(
+        d,
+        r'''
+import 'b.dart';
+''');
+    provider.newFile(
+        e,
+        r'''
+export 'b.dart';
+''');
+    provider.newFile(
+        f,
+        r'''
+import 'e.dart';
+class F extends X {}
+''');
+
+    driver.addFile(a);
+    driver.addFile(b);
+    driver.addFile(c);
+    driver.addFile(d);
+    driver.addFile(e);
+    driver.addFile(f);
+    await scheduler.waitForIdle();
+
+    // The file f.dart has an error or warning.
+    // So, its analysis will have higher priority.
+    expect(driver.fsState.getFileForPath(f).hasErrorOrWarning, isTrue);
+
+    allResults.clear();
+
+    // Update a.dart with changing its API signature.
+    provider.updateFile(b, 'class A {}');
+    driver.changeFile(b);
+    await scheduler.waitForIdle();
+
+    List<String> analyzedPaths = allResults.map((r) => r.path).toList();
+
+    // The changed file must be the first.
+    expect(analyzedPaths[0], b);
+
+    // Then the file that imports the changed file.
+    expect(analyzedPaths[1], d);
+
+    // Then the file that has an error (even if it is unrelated).
+    expect(analyzedPaths[2], f);
+  }
+
   test_results_priority() async {
     String content = 'int f() => 42;';
     addTestFile(content, priority: true);