Advance Wayland and KDE package bring-up

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/statesaverwidget.cpp

@@ -0,0 +1,85 @@
+/*
+    SPDX-FileCopyrightText: 2010 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.net>
+    SPDX-FileContributor: Stephen Kelly <stephen@kdab.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#include "statesaverwidget.h"
+
+#include <QApplication>
+#include <QSplitter>
+#include <QTreeView>
+
+#include <KConfig>
+#include <KConfigGroup>
+#include <ksharedconfig.h>
+
+#include "dynamictreemodel.h"
+#include "dynamictreewidget.h"
+
+QModelIndex DynamicTreeStateSaver::indexFromConfigString(const QAbstractItemModel *model, const QString &key) const
+{
+    QModelIndexList list = model->match(model->index(0, 0), DynamicTreeModel::DynamicTreeModelId, key.toInt(), 1, Qt::MatchRecursive);
+    if (list.isEmpty()) {
+        return QModelIndex();
+    }
+    return list.first();
+}
+
+QString DynamicTreeStateSaver::indexToConfigString(const QModelIndex &index) const
+{
+    return index.data(DynamicTreeModel::DynamicTreeModelId).toString();
+}
+
+DynamicTreeStateSaver::DynamicTreeStateSaver(QObject *parent)
+    : KViewStateSaver(parent)
+{
+}
+
+StateSaverWidget::StateSaverWidget(QWidget *parent, Qt::WindowFlags f)
+    : QWidget(parent, f)
+{
+    QSplitter *splitter = new QSplitter(this);
+    QHBoxLayout *layout = new QHBoxLayout(this);
+    layout->addWidget(splitter);
+
+    DynamicTreeModel *model = new DynamicTreeModel(this);
+
+    DynamicTreeWidget *dynamicTreeWidget = new DynamicTreeWidget(model, splitter);
+
+    m_view = new QTreeView(splitter);
+    m_view->setSelectionMode(QAbstractItemView::ExtendedSelection);
+    m_view->setModel(model);
+
+    connect(model, SIGNAL(modelAboutToBeReset()), SLOT(saveState()));
+    connect(model, SIGNAL(modelReset()), SLOT(restoreState()));
+    connect(qApp, SIGNAL(aboutToQuit()), SLOT(saveState()));
+
+    restoreState();
+}
+
+StateSaverWidget::~StateSaverWidget()
+{
+    saveState();
+}
+
+void StateSaverWidget::saveState()
+{
+    DynamicTreeStateSaver saver;
+    saver.setView(m_view);
+
+    KConfigGroup cfg(KSharedConfig::openConfig(), "ExampleViewState");
+    saver.saveState(cfg);
+    cfg.sync();
+}
+
+void StateSaverWidget::restoreState()
+{
+    DynamicTreeStateSaver *saver = new DynamicTreeStateSaver;
+    saver->setView(m_view);
+    KConfigGroup cfg(KSharedConfig::openConfig(), "ExampleViewState");
+    saver->restoreState(cfg);
+}
+
+#include "moc_statesaverwidget.cpp"