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/descendantqmltree.cpp

@@ -0,0 +1,41 @@
+/*
+    This file is part of the proxy model test suite.
+
+    SPDX-FileCopyrightText: 2020 Marco Martin <mart@kde.org>
+
+    SPDX-License-Identifier: LGPL-2.1-or-later
+*/
+
+#include "descendantqmltree.h"
+
+#include <QHBoxLayout>
+#include <QLabel>
+#include <QQmlContext>
+#include <QQmlEngine>
+#include <QQuickWidget>
+#include <QSplitter>
+#include <QTreeView>
+
+#include "dynamictreemodel.h"
+#include "dynamictreewidget.h"
+#include "kselectionproxymodel.h"
+
+DescendantQmlTreeWidget::DescendantQmlTreeWidget(QWidget *parent)
+    : QWidget(parent)
+{
+    QHBoxLayout *layout = new QHBoxLayout(this);
+    QSplitter *splitter = new QSplitter(this);
+    layout->addWidget(splitter);
+
+    m_rootModel = new DynamicTreeModel(this);
+
+    new DynamicTreeWidget(m_rootModel, splitter);
+
+    qmlRegisterType<KSelectionProxyModel>("KF5ItemModels", 1, 0, "SelectionProxyModel");
+
+    QQuickWidget *quickView = new QQuickWidget(splitter);
+
+    quickView->engine()->rootContext()->setContextProperty(QStringLiteral("_model"), m_rootModel);
+
+    quickView->setSource(QUrl::fromLocalFile(QLatin1String(SRC_DIR "/tree.qml")));
+}