fix: debounce resize and enlarge broadcast buffer for TUI resize stability

desktop/integration_test/cd_resize_test.dart

@@ -0,0 +1,91 @@
+// 专项验证：cd 跨目录 + resize 后内容不重复。
+import 'dart:typed_data';
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:flutter_alacritty/flutter_alacritty.dart';
+import 'package:integration_test/integration_test.dart';
+
+import 'package:rtty_desktop/main.dart' as app;
+import 'package:rtty_desktop/src/terminal_screen.dart';
+
+void main() {
+  IntegrationTestWidgetsFlutterBinding.ensureInitialized();
+
+  testWidgets('cd 跨目录 + resize 内容完整性', (WidgetTester tester) async {
+    await app.main();
+    await tester.pumpAndSettle();
+    await tester.tap(find.text('CONNECT'));
+    await tester.pump();
+
+    // 等待连接。
+    final deadline = DateTime.now().add(const Duration(seconds: 8));
+    while (DateTime.now().isBefore(deadline)) {
+      await tester.pump(const Duration(milliseconds: 200));
+      if (find.text('AWAITING CONNECTION').evaluate().isEmpty) break;
+    }
+    expect(find.text('AWAITING CONNECTION'), findsNothing);
+
+    final engine = tester
+        .state<TerminalViewState>(find.byType(TerminalView))
+        .widget
+        .engine;
+    engine.initializeEmpty(24, 80);
+
+    void send(String s) =>
+        engine.write(Uint8List.fromList(s.codeUnits));
+
+    String gridText() {
+      final g = engine.gridForView;
+      final sb = StringBuffer();
+      for (var r = 0; r < g.rows; r++) {
+        for (var c = 0; c < g.columns; c++) {
+          final cp = g.codepointAt(r, c);
+          sb.writeCharCode(cp == 0 ? 32 : cp);
+        }
+        sb.write('\n');
+      }
+      return sb.toString();
+    }
+
+    Future<bool> waitFor(bool Function(String) pred,
+        {int secs = 6}) async {
+      final end = DateTime.now().add(Duration(seconds: secs));
+      while (DateTime.now().isBefore(end)) {
+        await tester.pump(const Duration(milliseconds: 200));
+        if (pred(gridText())) return true;
+      }
+      return pred(gridText());
+    }
+
+    // ---- 1. cd 跨目录 ----
+    final target = r'C:\Users\NianJiu\rttytest\subdir';
+    send('cd $target\r\n');
+    final cdOk = await waitFor((t) => t.contains('rttytest\\subdir'));
+    debugPrint('cd 后 prompt 含目标目录: $cdOk');
+    if (!cdOk) debugPrint('--- grid ---\n${gridText()}');
+    expect(cdOk, isTrue, reason: 'cd 到绝对路径后 prompt 应显示新目录');
+
+    // ---- 2. resize 后内容不重复 ----
+    // 记录 resize 前的非空行。
+    send('dir\r\n');
+    final beforeOk = await waitFor((t) => t.contains('subdir') && t.contains('dir'));
+    debugPrint('dir 输出: $beforeOk');
+
+    // 连续 resize 数次（模拟窗口拖动），验证内容不产生重复/错乱。
+    for (final (c, r) in [(100, 30), (120, 35), (90, 28), (110, 32)]) {
+      engine.resize(columns: c, rows: r);
+      await tester.pump(const Duration(milliseconds: 150));
+    }
+    engine.resize(columns: 100, rows: 30);
+    await tester.pump(const Duration(milliseconds: 300));
+
+    // 重置引擎网格尺寸后，发送简单命令，验证仍能正常回显（无重复错乱）。
+    send('echo RESIZE_OK\r\n');
+    final ok = await waitFor((t) => t.contains('RESIZE_OK'));
+    debugPrint('resize 后命令回显: $ok');
+    expect(ok, isTrue, reason: 'resize 后命令应正常回显且无重复');
+
+    debugPrint('--- 最终 grid ---\n${gridText()}');
+  });
+}

desktop/integration_test/e2e_test.dart

@@ -5,7 +5,6 @@
 //
 // 运行前需先启动 Rust 服务端（cd .. && cargo run）。
 // 运行：flutter test integration_test -d windows
-import 'dart:async';
 import 'dart:typed_data';
 
 import 'package:flutter/foundation.dart';
@@ -74,7 +73,7 @@ String _gridText(TerminalEngine engine) {
   final sb = StringBuffer();
   for (var r = 0; r < grid.rows; r++) {
     for (var c = 0; c < grid.columns; c++) {
-      final cp = grid.codepointAt(r, c) as int;
+      final cp = grid.codepointAt(r, c);
       sb.writeCharCode(cp == 0 ? 32 : cp);
     }
     sb.write('\n');

desktop/lib/src/terminal_screen.dart

@@ -31,6 +31,11 @@ class _TerminalScreenState extends State<TerminalScreen> {
   StreamSubscription<Uint8List>? _engineOutputSub;
   StreamSubscription<Uint8List>? _backendOutputSub;
 
+  /// resize 防抖：窗口拖动时 onPtyResize 会高频触发，合并为最后一次。
+  Timer? _resizeDebounce;
+  int _pendingCols = 0;
+  int _pendingRows = 0;
+
   final _host = TextEditingController(text: '127.0.0.1');
   final _port = TextEditingController(text: '8080');
   final _session = TextEditingController();
@@ -101,6 +106,8 @@ class _TerminalScreenState extends State<TerminalScreen> {
   void _disconnect() => _tearDownSession();
 
   void _tearDownSession() {
+    _resizeDebounce?.cancel();
+    _resizeDebounce = null;
     _engineOutputSub?.cancel();
     _engineOutputSub = null;
     _backendOutputSub?.cancel();
@@ -121,15 +128,22 @@ class _TerminalScreenState extends State<TerminalScreen> {
   }
 
   void _handlePtyResize(int cols, int rows) {
-    final b = _backend;
-    if (b == null) return;
-    b.resize(rows, cols);
-    if (mounted) {
-      setState(() {
-        _cols = cols;
-        _rows = rows;
-      });
-    }
+    if (!mounted) return;
+    setState(() {
+      _cols = cols;
+      _rows = rows;
+    });
+
+    // 合并连续 resize：只发送最后一次，避免 TUI 频繁 SIGWINCH 重绘错乱。
+    _pendingCols = cols;
+    _pendingRows = rows;
+    _resizeDebounce?.cancel();
+    _resizeDebounce = Timer(const Duration(milliseconds: 80), () {
+      final b = _backend;
+      if (b == null) return;
+      // PtyBackend.resize(rows, columns) — 注意参数顺序为行/列。
+      b.resize(_pendingRows, _pendingCols);
+    });
   }
 
   @override

src/ws/handler.rs

@@ -276,7 +276,7 @@ fn create_session(
     )));
     let reader = pty.take_reader().ok_or_else(|| anyhow::anyhow!("pty reader already taken"))?;
 
-    let (output, _) = broadcast::channel(256);
+    let (output, _) = broadcast::channel(4096);
     let session = Arc::new(Session {
         id,
         pty: Arc::new(Mutex::new(pty)),