[flutter_tools] catch StdinException while trying to re-set single char mode (#107256)

packages/flutter_tools/lib/src/commands/run.dart

@@ -12,6 +12,7 @@ import 'package:vm_service/vm_service.dart';
 import '../android/android_device.dart';
 import '../base/common.dart';
 import '../base/file_system.dart';
+import '../base/io.dart';
 import '../base/utils.dart';
 import '../build_info.dart';
 import '../daemon.dart';
@@ -719,7 +720,11 @@ class RunCommand extends RunCommandBase {
     } finally {
       // However we exited from the runner, ensure the terminal has line mode
       // and echo mode enabled before we return the user to the shell.
-      globals.terminal.singleCharMode = false;
+      try {
+        globals.terminal.singleCharMode = false;
+      } on StdinException {
+        // Do nothing, if the STDIN handle is no longer available, there is nothing actionable for us to do at this point
+      }
     }
     return FlutterCommandResult(
       ExitStatus.success,

packages/flutter_tools/test/commands.shard/hermetic/run_test.dart

@@ -682,6 +682,28 @@ void main() {
       FileSystem: () => MemoryFileSystem.test(),
       ProcessManager: () => FakeProcessManager.any(),
     });
+
+    testUsingContext('Flutter run catches StdinException while setting terminal singleCharMode to false', () async {
+      fakeTerminal.hasStdin = false;
+      final FakeResidentRunner residentRunner = FakeResidentRunner();
+      final TestRunCommandWithFakeResidentRunner command = TestRunCommandWithFakeResidentRunner();
+      command.fakeResidentRunner = residentRunner;
+
+      try {
+        await createTestCommandRunner(command).run(<String>[
+          'run',
+          '--no-pub',
+        ]);
+      } catch (err) { // ignore: avoid_catches_without_on_clauses
+        fail('Expected no error, got $err');
+      }
+      expect(fakeTerminal.setSingleCharModeHistory, isEmpty);
+    }, overrides: <Type, Generator>{
+      AnsiTerminal: () => fakeTerminal,
+      Cache: () => Cache.test(processManager: FakeProcessManager.any()),
+      FileSystem: () => MemoryFileSystem.test(),
+      ProcessManager: () => FakeProcessManager.any(),
+    });
   });
 
   testUsingContext('Flutter run catches service has disappear errors and throws a tool exit', () async {
@@ -1050,6 +1072,9 @@ class CapturingAppDomain extends AppDomain {
 }
 
 class FakeAnsiTerminal extends Fake implements AnsiTerminal {
+  /// Setting to false will cause operations to Stdin to throw a [StdinException].
+  bool hasStdin = true;
+
   @override
   bool usesTerminalUi = false;
 
@@ -1057,7 +1082,12 @@ class FakeAnsiTerminal extends Fake implements AnsiTerminal {
   List<bool> setSingleCharModeHistory = <bool>[];
 
   @override
-  set singleCharMode(bool value) => setSingleCharModeHistory.add(value);
+  set singleCharMode(bool value) {
+    if (!hasStdin) {
+      throw const StdinException('Error setting terminal line mode', OSError('The handle is invalid', 6));
+    }
+    setSingleCharModeHistory.add(value);
+  }
 
   @override
   bool get singleCharMode => setSingleCharModeHistory.last;