fix: prevent crash when treeland restarts in taskbar

panels/dock/taskmanager/abstractwindowmonitor.cpp

@@ -158,5 +158,13 @@ void AbstractWindowMonitor::destroyWindow(AbstractWindow * window)
     endRemoveRows();
 }
 
+void AbstractWindowMonitor::clearTrackedWindows()
+{
+    if (m_trackedWindows.isEmpty())
+        return;
 
+    beginResetModel();
+    m_trackedWindows.clear();
+    endResetModel();
+}
 }

panels/dock/taskmanager/abstractwindowmonitor.h

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2023 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2023 - 2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: GPL-3.0-or-later
 
@@ -26,6 +26,7 @@ class AbstractWindowMonitor : public QAbstractListModel, public AbstractTaskMana
 
     void trackWindow(AbstractWindow* window);
     void destroyWindow(AbstractWindow * window);
+    void clearTrackedWindows();
 
     AbstractWindowMonitor(QObject* parent = nullptr);
     virtual void start() = 0;

panels/dock/taskmanager/treelandwindowmonitor.cpp

@@ -102,6 +102,7 @@ void TreeLandWindowMonitor::stop()
 
 void TreeLandWindowMonitor::clear()
 {
+    clearTrackedWindows();
     m_windows.clear();
     m_dockPreview.reset(nullptr);
     updateFullscreenState();

panels/dock/taskmanager/x11windowmonitor.cpp

@@ -91,6 +91,7 @@ void X11WindowMonitor::stop()
 
 void X11WindowMonitor::clear()
 {
+    clearTrackedWindows();
     m_windows.clear();
     m_windowPreview.reset(nullptr);
 }