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/proxymodeltestwidget.cpp

@@ -0,0 +1,57 @@
+/*
+    This file is part of the proxy model test suite.
+
+    SPDX-FileCopyrightText: 2009 Stephen Kelly <steveire@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.1-or-later
+*/
+
+#include "proxymodeltestwidget.h"
+
+#include <QPushButton>
+#include <QSplitter>
+#include <QTreeView>
+#include <QVBoxLayout>
+
+#include "dynamictreemodel.h"
+#include "kselectionproxymodel.h"
+#include "modelcommander.h"
+#if 0
+#include "kdescendantsproxymodel.h"
+#endif
+#include "modelcommanderwidget.h"
+
+ProxyModelTestWidget::ProxyModelTestWidget(QWidget *parent, Qt::WindowFlags f)
+    : QWidget(parent, f)
+{
+    QVBoxLayout *layout = new QVBoxLayout(this);
+    QSplitter *splitter = new QSplitter(this);
+
+    m_rootModel = new DynamicTreeModel(this);
+
+    (void)new ModelCommanderWidget(m_rootModel, splitter);
+
+    QTreeView *rootModelView = new QTreeView(splitter);
+    rootModelView->setModel(m_rootModel);
+    rootModelView->setSelectionMode(QTreeView::ExtendedSelection);
+
+    KSelectionProxyModel *selProxyModel = new KSelectionProxyModel(rootModelView->selectionModel(), this);
+    selProxyModel->setSourceModel(m_rootModel);
+    selProxyModel->setFilterBehavior(KSelectionProxyModel::ChildrenOfExactSelection);
+
+    QTreeView *selModelView = new QTreeView(splitter);
+    selModelView->setModel(selProxyModel);
+
+#if 0
+    KDescendantsProxyModel *descProxyModel = new KDescendantsProxyModel(this);
+    descProxyModel->setSourceModel(m_rootModel);
+    QTreeView *descProxyModelView = new QTreeView(splitter);
+    descProxyModelView ->setModel(descProxyModel);
+#endif
+
+    // Your Proxy Here?
+
+    layout->addWidget(splitter);
+}
+
+#include "moc_proxymodeltestwidget.cpp"