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/rearrangecolumns.cpp

@@ -0,0 +1,48 @@
+/*
+    SPDX-FileCopyrightText: 2020 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
+    SPDX-FileContributor: David Faure <david.faure@kdab.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#include <KRearrangeColumnsProxyModel>
+#include <QApplication>
+#include <QStandardItemModel>
+#include <QTimer>
+#include <QTreeView>
+
+// Prepares one row for a QStandardItemModel
+inline QList<QStandardItem *> makeStandardItems(const QStringList &texts)
+{
+    QList<QStandardItem *> items;
+    items.reserve(texts.count());
+    for (const QString &txt : texts) {
+        items << new QStandardItem(txt);
+    }
+    return items;
+}
+
+int main(int argc, char **argv)
+{
+    QApplication app(argc, argv);
+
+    QStandardItemModel source;
+    source.insertRow(0, makeStandardItems({QStringLiteral("A0"), QStringLiteral("B0"), QStringLiteral("C0"), QStringLiteral("D0")}));
+    source.insertRow(1, makeStandardItems({QStringLiteral("A1"), QStringLiteral("B1"), QStringLiteral("C1"), QStringLiteral("D1")}));
+    source.insertRow(2, makeStandardItems({QStringLiteral("A2"), QStringLiteral("B2"), QStringLiteral("C2"), QStringLiteral("D2")}));
+    source.setHorizontalHeaderLabels({QStringLiteral("H1"), QStringLiteral("H2"), QStringLiteral("H3"), QStringLiteral("H4")});
+
+    KRearrangeColumnsProxyModel pm;
+    pm.setSourceColumns(QList<int>{2, 3, 1, 0});
+    pm.setSourceModel(&source);
+
+    QTreeView treeView;
+    treeView.setModel(&pm);
+    treeView.show();
+
+    QTimer::singleShot(500, &pm, [&]() {
+        pm.setSourceColumns(QList<int>{2, 1, 0, 3});
+    });
+
+    return app.exec();
+}