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/lessthanwidget.cpp

@@ -0,0 +1,106 @@
+/*
+    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 "lessthanwidget.h"
+
+#include <QLabel>
+#include <QTreeView>
+#include <QVBoxLayout>
+
+ColoredTreeModel::ColoredTreeModel(QObject *parent)
+    : DynamicTreeModel(parent)
+    , m_selectionModel(nullptr)
+    , m_lessThanColour(Qt::yellow)
+    , m_greaterThanColour(Qt::red)
+{
+}
+
+void ColoredTreeModel::setSelectionModel(QItemSelectionModel *selectionModel)
+{
+    m_selectionModel = selectionModel;
+    connect(selectionModel, SIGNAL(selectionChanged(QItemSelection, QItemSelection)), SLOT(recolor()));
+}
+
+void ColoredTreeModel::recolor(const QModelIndex &parent)
+{
+    const QModelIndex topLeft = index(0, 0, parent);
+    const int _rowCount = rowCount(parent);
+    const QModelIndex bottomRight = index(_rowCount - 1, columnCount(parent) - 1, parent);
+    Q_EMIT dataChanged(topLeft, bottomRight);
+
+    static const int column = 0;
+    QModelIndex idx;
+    for (int row = 0; row < _rowCount; ++row) {
+        idx = index(row, column, parent);
+        if (hasChildren(idx)) {
+            recolor(idx);
+        }
+    }
+}
+
+QVariant ColoredTreeModel::data(const QModelIndex &index, int role) const
+{
+    if (role != Qt::BackgroundRole || !m_selectionModel || m_selectionModel->selection().indexes().size() != 1) {
+        return DynamicTreeModel::data(index, role);
+    }
+
+    const QModelIndex selectedIndex = m_selectionModel->selection().indexes().first();
+
+    if (index == selectedIndex) {
+        return DynamicTreeModel::data(index, role);
+    }
+
+    if (index < selectedIndex) {
+        return m_lessThanColour;
+    }
+
+    Q_ASSERT(selectedIndex < index);
+
+    return m_greaterThanColour;
+}
+
+void LessThanWidget::insertGrid(QList<int> address)
+{
+    ModelInsertCommand *ins = new ModelInsertCommand(m_coloredTreeModel, this);
+    ins->setAncestorRowNumbers(address);
+    ins->setNumCols(5);
+    ins->setStartRow(0);
+    ins->setEndRow(5);
+    ins->doCommand();
+}
+
+LessThanWidget::LessThanWidget(QWidget *parent, Qt::WindowFlags f)
+    : QWidget(parent, f)
+{
+    QLabel *explanation = new QLabel(this);
+    explanation->setText(
+        QLatin1String("The yellow items are 'less than' the selected item according to QModelIndex::operator<().\n"
+                      "The red items are greater than the selected item (i.e, not less than and not equal)."));
+
+    m_coloredTreeModel = new ColoredTreeModel(this);
+    QTreeView *treeView = new QTreeView(this);
+    treeView->setModel(m_coloredTreeModel);
+    treeView->setSelectionBehavior(QAbstractItemView::SelectItems);
+    treeView->setSelectionMode(QTreeView::SingleSelection);
+
+    m_coloredTreeModel->setSelectionModel(treeView->selectionModel());
+
+    QVBoxLayout *layout = new QVBoxLayout(this);
+    layout->addWidget(explanation);
+    layout->addWidget(treeView);
+
+    insertGrid(QList<int>());
+    insertGrid(QList<int>() << 2);
+    insertGrid(QList<int>() << 3);
+    insertGrid(QList<int>() << 4);
+    insertGrid(QList<int>() << 3 << 2);
+    insertGrid(QList<int>() << 3 << 3);
+    insertGrid(QList<int>() << 3 << 4);
+}
+
+#include "moc_lessthanwidget.cpp"