fix: correct terminal mouse selection and scroll coordinates (#15915)

Signed-off-by: fufesou <linlong1266@gmail.com>

flutter/lib/desktop/pages/terminal_page.dart

@@ -5,7 +5,7 @@ import 'package:flutter_hbb/common.dart';
 import 'package:flutter_hbb/desktop/widgets/tabbar_widget.dart';
 import 'package:flutter_hbb/models/model.dart';
 import 'package:flutter_hbb/models/terminal_model.dart';
-import 'package:xterm/xterm.dart';
+import 'package:flutter_hbb/models/terminal_mouse_handler.dart';
 import 'terminal_connection_manager.dart';
 
 class TerminalPage extends StatefulWidget {
@@ -197,7 +197,7 @@ class _TerminalPageState extends State<TerminalPage>
       body: LayoutBuilder(
         builder: (context, constraints) {
           final heightPx = constraints.maxHeight;
-          return TerminalView(
+          return TerminalMouseInteraction(
             _terminalModel.terminal,
             controller: _terminalModel.terminalController,
             focusNode: _terminalFocusNode,

flutter/lib/models/terminal_mouse_drag_reporter.dart

@@ -0,0 +1,235 @@
+import 'dart:async';
+
+import 'package:flutter/gestures.dart';
+import 'package:flutter/services.dart';
+import 'package:xterm/xterm.dart';
+
+const _cellIndexOffset = 1;
+const _legacyCodeOffset = 32;
+const _leftButtonCode = 0;
+const _motionButtonCode = 32;
+const _releaseButtonCode = 3;
+const _shiftModifierCode = 4;
+const _metaModifierCode = 8;
+const _controlModifierCode = 16;
+const _modifierCodeMask =
+    _shiftModifierCode | _metaModifierCode | _controlModifierCode;
+const _normalCoordinateLimit = 223;
+const _utfCoordinateLimit = 2015;
+
+String encodeTerminalMouseReport(
+  MouseReportMode mode,
+  int button,
+  CellOffset position, {
+  bool release = false,
+}) {
+  final x = position.x + _cellIndexOffset;
+  final y = position.y + _cellIndexOffset;
+  final reportedButton =
+      release ? _releaseButtonCode | (button & _modifierCodeMask) : button;
+  switch (mode) {
+    case MouseReportMode.normal:
+    case MouseReportMode.utf:
+      final limit = mode == MouseReportMode.normal
+          ? _normalCoordinateLimit
+          : _utfCoordinateLimit;
+      final encodedButton =
+          String.fromCharCode(_legacyCodeOffset + reportedButton);
+      return '\x1b[M$encodedButton${_legacyCoordinate(x, limit)}'
+          '${_legacyCoordinate(y, limit)}';
+    case MouseReportMode.sgr:
+      final suffix = release ? 'm' : 'M';
+      return '\x1b[<$button;$x;$y$suffix';
+    case MouseReportMode.urxvt:
+      return '\x1b[${_legacyCodeOffset + reportedButton};$x;${y}M';
+  }
+}
+
+String _legacyCoordinate(int value, int limit) =>
+    value > limit ? '\x00' : String.fromCharCode(_legacyCodeOffset + value);
+
+int _activeModifierCode() {
+  final keyboard = HardwareKeyboard.instance;
+  return (keyboard.isShiftPressed ? _shiftModifierCode : 0) |
+      (keyboard.isAltPressed ? _metaModifierCode : 0) |
+      (keyboard.isControlPressed ? _controlModifierCode : 0);
+}
+
+class TerminalMouseDragReporter {
+  int? _pointerId;
+  TerminalController? _controller;
+  late CellOffset _lastReportedPosition;
+  var _ownsControllerSuspension = false;
+  var _releasePending = false;
+  var _reporting = false;
+
+  bool handleDown(
+    PointerDownEvent event,
+    Terminal terminal,
+    TerminalViewState? terminalView,
+  ) {
+    if (!_isPrimaryMouse(event) || !_reportsDrag(terminal.mouseMode)) {
+      return false;
+    }
+    if (terminalView == null || terminalView.widget.readOnly) return false;
+    final controller = terminalView.widget.controller;
+    if (controller == null ||
+        controller.suspendedPointerInputs ||
+        !controller.pointerInput.inputs.contains(PointerInput.tap)) {
+      return false;
+    }
+
+    cancel();
+    _pointerId = event.pointer;
+    _controller = controller;
+    _ownsControllerSuspension = true;
+    _releasePending = true;
+    _reporting = true;
+    controller.setSuspendPointerInput(true);
+    _clearSelection(controller);
+    final position = _cellAt(event, terminalView);
+    _lastReportedPosition = position;
+    terminal.textInput(
+      _report(terminal.mouseReportMode, position),
+    );
+    return true;
+  }
+
+  bool handleMove(
+    PointerMoveEvent event,
+    Terminal terminal,
+    TerminalViewState? terminalView,
+  ) {
+    if (event.pointer != _pointerId) return false;
+    if (terminalView == null) {
+      cancel();
+      return true;
+    }
+    final reportsDrag = _reportsDrag(terminal.mouseMode);
+    if (!_isPrimaryMouse(event)) {
+      if (_releasePending && reportsDrag) {
+        _reportRelease(
+          terminal,
+          _reporting ? _cellAt(event, terminalView) : _lastReportedPosition,
+        );
+      }
+      cancel();
+      return true;
+    }
+    if (!_reporting || !reportsDrag) {
+      if (!reportsDrag) _releasePending = false;
+      _reporting = false;
+      // Keep ownership until the matching end event to suppress local selection.
+      final controller = _controller;
+      scheduleMicrotask(() => _clearSelection(controller));
+      return true;
+    }
+
+    final position = _cellAt(event, terminalView);
+    _lastReportedPosition = position;
+    terminal.textInput(
+      _report(terminal.mouseReportMode, position, motion: true),
+    );
+    final controller = _controller;
+    scheduleMicrotask(() => _clearSelection(controller));
+    return true;
+  }
+
+  bool handleEnd(
+    PointerEvent event,
+    Terminal terminal,
+    TerminalViewState? terminalView,
+  ) {
+    if (event.pointer != _pointerId) return false;
+    if (terminalView != null &&
+        _releasePending &&
+        _reportsDrag(terminal.mouseMode)) {
+      _reportRelease(
+        terminal,
+        _reporting ? _cellAt(event, terminalView) : _lastReportedPosition,
+      );
+    }
+    _clearSelection(_controller);
+    final controller = _controller;
+    _pointerId = null;
+    // Keep xterm's tap recognizer suspended for this pointer event.
+    scheduleMicrotask(() {
+      if (_pointerId == null && identical(_controller, controller)) {
+        _clearSelection(controller);
+        cancel();
+      }
+    });
+    return true;
+  }
+
+  void cancel() {
+    final controller = _controller;
+    if (_ownsControllerSuspension) {
+      controller?.setSuspendPointerInput(false);
+    }
+    _pointerId = null;
+    _controller = null;
+    _ownsControllerSuspension = false;
+    _releasePending = false;
+    _reporting = false;
+  }
+
+  void updateController(TerminalController controller) {
+    final oldController = _controller;
+    if (_pointerId == null || oldController == null) {
+      cancel();
+      return;
+    }
+    if (identical(oldController, controller)) return;
+    if (_ownsControllerSuspension) {
+      oldController.setSuspendPointerInput(false);
+    }
+    final acceptsPointerInput = !controller.suspendedPointerInputs &&
+        controller.pointerInput.inputs.contains(PointerInput.tap);
+    _controller = controller;
+    _ownsControllerSuspension = acceptsPointerInput;
+    _reporting = _reporting && acceptsPointerInput;
+    if (_ownsControllerSuspension) controller.setSuspendPointerInput(true);
+    _clearSelection(controller);
+  }
+
+  void _reportRelease(Terminal terminal, CellOffset position) {
+    terminal.textInput(
+      _report(
+        terminal.mouseReportMode,
+        position,
+        release: true,
+      ),
+    );
+  }
+
+  CellOffset _cellAt(PointerEvent event, TerminalViewState terminalView) {
+    final renderTerminal = terminalView.renderTerminal;
+    return renderTerminal.getCellOffset(
+      renderTerminal.globalToLocal(event.position),
+    );
+  }
+
+  bool _isPrimaryMouse(PointerEvent event) =>
+      event.kind == PointerDeviceKind.mouse &&
+      (event.buttons & kPrimaryMouseButton) == kPrimaryMouseButton;
+
+  bool _reportsDrag(MouseMode mode) =>
+      mode == MouseMode.upDownScrollDrag || mode == MouseMode.upDownScrollMove;
+
+  void _clearSelection(TerminalController? controller) {
+    if (controller == null || controller.selection == null) return;
+    controller.clearSelection();
+  }
+
+  String _report(
+    MouseReportMode mode,
+    CellOffset position, {
+    bool release = false,
+    bool motion = false,
+  }) {
+    final baseButton = motion ? _motionButtonCode : _leftButtonCode;
+    final button = baseButton | _activeModifierCode();
+    return encodeTerminalMouseReport(mode, button, position, release: release);
+  }
+}

flutter/lib/models/terminal_mouse_handler.dart

@@ -1,10 +1,18 @@
+import 'dart:async';
+
+import 'package:flutter/gestures.dart';
+import 'package:flutter/widgets.dart';
 import 'package:xterm/xterm.dart';
 
+import 'terminal_mouse_drag_reporter.dart';
+
 /// xterm 4.0.0 encodes wheel buttons as 68..71; the extra bit reads as a Shift
 /// modifier, so strict full-screen apps ignore the report and never scroll.
 /// Upstream fix: TerminalStudio/xterm.dart#238.
 class WheelButtonFixMouseHandler implements TerminalMouseHandler {
-  const WheelButtonFixMouseHandler();
+  const WheelButtonFixMouseHandler({this.positionProvider});
+
+  final CellOffset? Function()? positionProvider;
 
   @override
   String? call(TerminalMouseEvent event) {
@@ -23,20 +31,268 @@ class WheelButtonFixMouseHandler implements TerminalMouseHandler {
   String _reportWheel(TerminalMouseEvent event) {
     // Wheel buttons 4..7 go on the wire as 64..67, but `id` is 64 + 4..7.
     final button = event.button.id - 4;
-    final x = event.position.x + 1;
+    final position = positionProvider?.call() ?? event.position;
-    final y = event.position.y + 1;
+    return encodeTerminalMouseReport(
-    switch (event.state.mouseReportMode) {
+      event.state.mouseReportMode,
-      case MouseReportMode.normal:
+      button,
-      case MouseReportMode.utf:
+      position,
-        final limit =
+    );
-            event.state.mouseReportMode == MouseReportMode.normal ? 223 : 2015;
+  }
-        final col = x > limit ? '\x00' : String.fromCharCode(32 + x);
+}
-        final row = y > limit ? '\x00' : String.fromCharCode(32 + y);
+
-        return '\x1b[M${String.fromCharCode(32 + button)}$col$row';
+class TerminalMouseInteraction extends StatefulWidget {
-      case MouseReportMode.sgr:
+  const TerminalMouseInteraction(
-        return '\x1b[<$button;$x;${y}M';
+    this.terminal, {
-      case MouseReportMode.urxvt:
+    super.key,
-        return '\x1b[${32 + button};$x;${y}M';
+    required this.controller,
-    }
+    this.focusNode,
+    this.backgroundOpacity = 1,
+    this.padding,
+    this.onSecondaryTapDown,
+  });
+
+  final Terminal terminal;
+  final TerminalController controller;
+  final FocusNode? focusNode;
+  final double backgroundOpacity;
+  final EdgeInsets? padding;
+  final void Function(TapDownDetails, CellOffset)? onSecondaryTapDown;
+
+  @override
+  State<TerminalMouseInteraction> createState() =>
+      _TerminalMouseInteractionState();
+}
+
+class _TerminalMouseInteractionState extends State<TerminalMouseInteraction> {
+  static const _selectionScrollInterval = Duration(milliseconds: 50);
+  static const _noScroll = 0;
+  static const _scrollUp = -1;
+  static const _scrollDown = 1;
+
+  final _terminalViewKey = GlobalKey<TerminalViewState>();
+  final _scrollController = ScrollController();
+  final _mouseDrag = TerminalMouseDragReporter();
+  late final WheelButtonFixMouseHandler _mouseHandler;
+  TerminalMouseHandler? _previousMouseHandler;
+  Offset? _pointerPosition;
+  Offset? _selectionPointer;
+  CellAnchor? _selectionBase;
+  Buffer? _selectionBuffer;
+  int? _selectionPointerId;
+  Timer? _selectionScrollTimer;
+  var _selectionHasScrolled = false;
+  var _scrollDirection = _noScroll;
+  TerminalViewState? get _terminalView => _terminalViewKey.currentState;
+
+  @override
+  void initState() {
+    super.initState();
+    _mouseHandler = WheelButtonFixMouseHandler(
+      positionProvider: _cellAtPointer,
+    );
+    _installMouseHandler(widget.terminal);
+  }
+
+  @override
+  void didUpdateWidget(TerminalMouseInteraction oldWidget) {
+    super.didUpdateWidget(oldWidget);
+    final terminalChanged = !identical(oldWidget.terminal, widget.terminal);
+    final controllerChanged =
+        !identical(oldWidget.controller, widget.controller);
+    if (!terminalChanged && !controllerChanged) return;
+    if (controllerChanged && !terminalChanged) {
+      _mouseDrag.updateController(widget.controller);
+    } else {
+      _mouseDrag.cancel();
+    }
+    _clearSelectionDrag();
+    if (!terminalChanged) return;
+    _restoreMouseHandler(oldWidget.terminal);
+    _installMouseHandler(widget.terminal);
+  }
+
+  void _installMouseHandler(Terminal terminal) {
+    _previousMouseHandler = terminal.mouseHandler;
+    terminal.mouseHandler = _mouseHandler;
+  }
+
+  void _restoreMouseHandler(Terminal terminal) {
+    if (identical(terminal.mouseHandler, _mouseHandler)) {
+      terminal.mouseHandler = _previousMouseHandler;
+    }
+  }
+
+  CellOffset? _cellAtPointer() {
+    final terminalView = _terminalView;
+    final pointerPosition = _pointerPosition;
+    if (terminalView == null || pointerPosition == null) return null;
+    final renderTerminal = terminalView.renderTerminal;
+    return renderTerminal.getCellOffset(
+      renderTerminal.globalToLocal(pointerPosition),
+    );
+  }
+
+  void _updatePointerPosition(PointerEvent event) =>
+      _pointerPosition = event.position;
+
+  void _handlePointerDown(PointerDownEvent event) {
+    _updatePointerPosition(event);
+    if (_mouseDrag.handleDown(event, widget.terminal, _terminalView)) {
+      _clearSelectionDrag();
+      return;
+    }
+    if (event.kind != PointerDeviceKind.mouse ||
+        (event.buttons & kPrimaryMouseButton) != kPrimaryMouseButton) {
+      return;
+    }
+    _clearSelectionDrag();
+    final terminalView = _terminalView;
+    if (terminalView == null) return;
+    final renderTerminal = terminalView.renderTerminal;
+    final localPosition = renderTerminal.globalToLocal(event.position);
+    final selectionBuffer = widget.terminal.buffer;
+    _selectionPointerId = event.pointer;
+    _selectionBase = selectionBuffer.createAnchorFromOffset(
+      renderTerminal.getCellOffset(localPosition),
+    );
+    _selectionBuffer = selectionBuffer;
+    _selectionPointer = localPosition;
+  }
+
+  void _handlePointerMove(PointerMoveEvent event) {
+    _updatePointerPosition(event);
+    if (_mouseDrag.handleMove(event, widget.terminal, _terminalView)) return;
+    if (event.pointer != _selectionPointerId) return;
+    if (event.kind != PointerDeviceKind.mouse ||
+        (event.buttons & kPrimaryMouseButton) != kPrimaryMouseButton) {
+      _clearSelectionDrag();
+      return;
+    }
+    final terminalView = _terminalView;
+    if (terminalView == null || _selectionBase == null) return;
+    final renderTerminal = terminalView.renderTerminal;
+    final localPosition = renderTerminal.globalToLocal(event.position);
+    _selectionPointer = localPosition;
+    _setScrollDirection(
+      _directionFor(localPosition, renderTerminal.paintBounds),
+    );
+    if (_selectionHasScrolled) {
+      scheduleMicrotask(() => _scrollSelection(scroll: false));
+    }
+  }
+
+  int _directionFor(Offset position, Rect bounds) {
+    if (position.dy < bounds.top) return _scrollUp;
+    if (position.dy >= bounds.bottom) return _scrollDown;
+    return _noScroll;
+  }
+
+  void _setScrollDirection(int direction) {
+    if (_scrollDirection == direction) return;
+    _stopAutoScroll();
+    _scrollDirection = direction;
+    if (direction == _noScroll) return;
+    _scrollSelection();
+    if (_scrollDirection != _noScroll) {
+      _selectionScrollTimer = Timer.periodic(
+        _selectionScrollInterval,
+        (_) => _scrollSelection(),
+      );
+    }
+  }
+
+  void _scrollSelection({bool scroll = true}) {
+    final terminalView = _terminalView;
+    final selectionBase = _selectionBase;
+    final selectionBuffer = _selectionBuffer;
+    final selectionPointer = _selectionPointer;
+    if (terminalView == null ||
+        selectionBase == null ||
+        selectionBuffer == null ||
+        selectionPointer == null ||
+        !_scrollController.hasClients) {
+      return;
+    }
+    if (!identical(selectionBuffer, widget.terminal.buffer) ||
+        !selectionBase.attached) {
+      _clearSelectionDrag();
+      return;
+    }
+    final renderTerminal = terminalView.renderTerminal;
+    if (scroll) {
+      final position = _scrollController.position;
+      final target =
+          (position.pixels + renderTerminal.lineHeight * _scrollDirection)
+              .clamp(position.minScrollExtent, position.maxScrollExtent)
+              .toDouble();
+      if (target == position.pixels) {
+        _stopAutoScroll();
+      } else {
+        position.jumpTo(target);
+        _selectionHasScrolled = true;
+      }
+    }
+    renderTerminal.selectCharacters(
+      renderTerminal.getOffset(selectionBase.offset),
+      selectionPointer,
+    );
+  }
+
+  void _handlePointerEnd(PointerEvent event) {
+    _updatePointerPosition(event);
+    if (!_mouseDrag.handleEnd(event, widget.terminal, _terminalView) &&
+        event.pointer != _selectionPointerId) return;
+    if (_selectionHasScrolled) _scrollSelection(scroll: false);
+    _clearSelectionDrag();
+  }
+
+  void _clearSelectionDrag() {
+    _selectionPointerId = null;
+    _selectionBase?.dispose();
+    _selectionBase = null;
+    _selectionBuffer = null;
+    _selectionPointer = null;
+    _selectionHasScrolled = false;
+    _stopAutoScroll();
+  }
+
+  void _stopAutoScroll() {
+    _selectionScrollTimer?.cancel();
+    _selectionScrollTimer = null;
+    _scrollDirection = _noScroll;
+  }
+
+  @override
+  void dispose() {
+    _mouseDrag.cancel();
+    _clearSelectionDrag();
+    _restoreMouseHandler(widget.terminal);
+    _scrollController.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Listener(
+      onPointerDown: _handlePointerDown,
+      onPointerMove: _handlePointerMove,
+      onPointerUp: _handlePointerEnd,
+      onPointerHover: _updatePointerPosition,
+      onPointerCancel: _handlePointerEnd,
+      onPointerSignal: _updatePointerPosition,
+      onPointerPanZoomStart: _updatePointerPosition,
+      onPointerPanZoomUpdate: _updatePointerPosition,
+      onPointerPanZoomEnd: _updatePointerPosition,
+      child: TerminalView(
+        widget.terminal,
+        key: _terminalViewKey,
+        controller: widget.controller,
+        scrollController: _scrollController,
+        focusNode: widget.focusNode,
+        backgroundOpacity: widget.backgroundOpacity,
+        padding: widget.padding,
+        onSecondaryTapDown: widget.onSecondaryTapDown,
+      ),
+    );
   }
 }

flutter/test/terminal_mouse_handler_test.dart

@@ -1,7 +1,33 @@
 import 'package:flutter_hbb/models/terminal_mouse_handler.dart';
+import 'package:flutter/gestures.dart';
+import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:xterm/xterm.dart';
 
+const _terminalSize = Size(400, 120);
+
+Widget _terminalHarness(
+  Terminal terminal,
+  TerminalController controller,
+) =>
+    MaterialApp(
+      home: Align(
+        alignment: Alignment.topLeft,
+        child: SizedBox(
+          width: _terminalSize.width,
+          height: _terminalSize.height,
+          child: TerminalMouseInteraction(
+            terminal,
+            controller: controller,
+          ),
+        ),
+      ),
+    );
+
+void _writeLines(Terminal terminal, int count) => terminal.write(
+      List.generate(count, (index) => 'line $index\r\n').join(),
+    );
+
 void main() {
   late Terminal terminal;
   late List<String> output;
@@ -111,4 +137,133 @@ void main() {
       isNull,
     );
   });
+
+  testWidgets('dragging below scrolls and extends selection', (tester) async {
+    final controller = TerminalController();
+    _writeLines(terminal, 80);
+    await tester.pumpWidget(_terminalHarness(terminal, controller));
+    final terminalView =
+        tester.state<TerminalViewState>(find.byType(TerminalView));
+    final scrollController = terminalView.widget.scrollController!;
+    scrollController.jumpTo(0);
+    await tester.pump();
+    final renderTerminal = terminalView.renderTerminal;
+    const localStart = Offset(20, 20);
+    final startCell = renderTerminal.getCellOffset(localStart);
+    final mouse = TestPointer(1, PointerDeviceKind.mouse);
+    final outside = Offset(20, renderTerminal.size.height);
+    await tester.handlePointerEventRecord([
+      PointerEventRecord(Duration.zero, [
+        mouse.down(renderTerminal.localToGlobal(localStart)),
+        mouse.move(renderTerminal.localToGlobal(outside)),
+      ]),
+      PointerEventRecord(const Duration(milliseconds: 150), [
+        mouse.move(
+          renderTerminal.localToGlobal(outside + const Offset(1, 1)),
+        ),
+        mouse.up(),
+      ]),
+    ]);
+
+    expect(scrollController.offset, greaterThan(0));
+    expect(controller.selection!.begin, startCell);
+    expect(controller.selection!.end.y, greaterThan(startCell.y));
+    final releasedOffset = scrollController.offset;
+    await tester.pump(const Duration(milliseconds: 100));
+    expect(scrollController.offset, releasedOffset);
+  });
+
+  testWidgets('tmux mouse input is reported without local selection',
+      (tester) async {
+    final controller = TerminalController();
+    terminal.write('\x1b[?1049h\x1b[?1002h\x1b[?1006hword');
+    await tester.pumpWidget(_terminalHarness(terminal, controller));
+    final renderTerminal = tester
+        .state<TerminalViewState>(find.byType(TerminalView))
+        .renderTerminal;
+    const wheel = Offset(120, 40);
+    await tester.sendEventToBinding(
+      PointerScrollEvent(
+        position: renderTerminal.localToGlobal(wheel),
+        scrollDelta: const Offset(0, 40),
+      ),
+    );
+    await tester.pump();
+    final wheelCell = renderTerminal.getCellOffset(wheel);
+    expect(output.first, '\x1b[<65;${wheelCell.x + 1};${wheelCell.y + 1}M');
+    output.clear();
+    final clickPosition =
+        renderTerminal.getOffset(const CellOffset(0, 0)) + const Offset(1, 1);
+    final clickCell = renderTerminal.getCellOffset(clickPosition);
+    final mouse = await tester.createGesture(kind: PointerDeviceKind.mouse);
+    await mouse.down(renderTerminal.localToGlobal(clickPosition));
+    await mouse.up();
+    await tester.pump();
+    await mouse.down(renderTerminal.localToGlobal(clickPosition));
+    await mouse.up();
+    await tester.pump(kDoubleTapTimeout);
+    expect(output, [
+      '\x1b[<0;${clickCell.x + 1};${clickCell.y + 1}M',
+      '\x1b[<0;${clickCell.x + 1};${clickCell.y + 1}m',
+      '\x1b[<0;${clickCell.x + 1};${clickCell.y + 1}M',
+      '\x1b[<0;${clickCell.x + 1};${clickCell.y + 1}m',
+    ]);
+    expect(controller.selection, isNull);
+    expect(controller.suspendedPointerInputs, isFalse);
+    output.clear();
+    const start = Offset(40, 40);
+    const end = Offset(240, 80);
+    final startCell = renderTerminal.getCellOffset(start);
+    final endCell = renderTerminal.getCellOffset(end);
+    await mouse.down(renderTerminal.localToGlobal(start));
+    await mouse.moveTo(renderTerminal.localToGlobal(end));
+    await tester.pump();
+
+    expect(output, [
+      '\x1b[<0;${startCell.x + 1};${startCell.y + 1}M',
+      '\x1b[<32;${endCell.x + 1};${endCell.y + 1}M',
+    ]);
+    expect(controller.selection, isNull);
+    await mouse.up();
+    expect(output.last, '\x1b[<0;${endCell.x + 1};${endCell.y + 1}m');
+    expect(controller.suspendedPointerInputs, isFalse);
+  });
+
+  testWidgets('tmux drag stays suppressed after mouse mode is disabled',
+      (tester) async {
+    final controller = TerminalController();
+    terminal.write('\x1b[?1049h\x1b[?1002h\x1b[?1006hword');
+    await tester.pumpWidget(_terminalHarness(terminal, controller));
+    final renderTerminal = tester
+        .state<TerminalViewState>(find.byType(TerminalView))
+        .renderTerminal;
+    final mouse = await tester.createGesture(kind: PointerDeviceKind.mouse);
+    final start = renderTerminal.localToGlobal(const Offset(40, 40));
+    final end = renderTerminal.localToGlobal(const Offset(240, 80));
+    await mouse.down(start);
+    output.clear();
+    terminal.write('\x1b[?1002l');
+    await mouse.moveTo(end);
+
+    expect(output, isEmpty);
+    expect(controller.selection, isNull);
+    expect(controller.suspendedPointerInputs, isTrue);
+    terminal.write('\x1b[?1002h');
+    await mouse.moveTo(start);
+    expect(output, isEmpty);
+    expect(controller.selection, isNull);
+    await mouse.up();
+    expect(output, isEmpty);
+    expect(controller.suspendedPointerInputs, isFalse);
+
+    await mouse.down(start);
+    output.clear();
+    terminal.write('\x1b[?1002l');
+    await mouse.up();
+    await tester.pump(kDoubleTapTimeout);
+
+    expect(output, isEmpty);
+    expect(controller.selection, isNull);
+    expect(controller.suspendedPointerInputs, isFalse);
+  });
 }