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-kwidgetsaddons/source/src/kviewstatemaintainerbase.cpp

@@ -0,0 +1,120 @@
+/*
+    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 "kviewstatemaintainerbase.h"
+
+#include <QAbstractItemView>
+#include <QItemSelectionModel>
+#include <QPointer>
+
+class KViewStateMaintainerBasePrivate
+{
+    KViewStateMaintainerBasePrivate(KViewStateMaintainerBase *qq)
+        : q_ptr(qq)
+    {
+    }
+
+    Q_DECLARE_PUBLIC(KViewStateMaintainerBase)
+    KViewStateMaintainerBase *const q_ptr;
+
+    void slotModelAboutToBeReset();
+    void slotModelReset();
+
+    QPointer<QAbstractItemView> m_view;
+    QMetaObject::Connection m_viewModelAboutToBeResetConnection;
+    QMetaObject::Connection m_viewModelResetConnection;
+
+    QPointer<QItemSelectionModel> m_selectionModel;
+    QMetaObject::Connection m_selectionModelAboutToBeResetConnection;
+    QMetaObject::Connection m_selectionModelResetConnection;
+};
+
+void KViewStateMaintainerBasePrivate::slotModelAboutToBeReset()
+{
+    Q_Q(KViewStateMaintainerBase);
+    q->saveState();
+}
+
+void KViewStateMaintainerBasePrivate::slotModelReset()
+{
+    Q_Q(KViewStateMaintainerBase);
+    q->restoreState();
+}
+
+KViewStateMaintainerBase::KViewStateMaintainerBase(QObject *parent)
+    : QObject(parent)
+    , d_ptr(new KViewStateMaintainerBasePrivate(this))
+{
+}
+
+KViewStateMaintainerBase::~KViewStateMaintainerBase() = default;
+
+QItemSelectionModel *KViewStateMaintainerBase::selectionModel() const
+{
+    Q_D(const KViewStateMaintainerBase);
+    if (d->m_selectionModel.isNull()) {
+        return nullptr;
+    }
+    return d->m_selectionModel.data();
+}
+
+void KViewStateMaintainerBase::setSelectionModel(QItemSelectionModel *selectionModel)
+{
+    Q_D(KViewStateMaintainerBase);
+    if (selectionModel == d->m_selectionModel) {
+        return;
+    }
+
+    d->m_selectionModel = selectionModel;
+
+    if (d->m_view && d->m_view->model()) {
+        disconnect(d->m_selectionModelAboutToBeResetConnection);
+        disconnect(d->m_selectionModelResetConnection);
+    }
+
+    d->m_viewModelAboutToBeResetConnection = connect(d->m_selectionModel->model(), &QAbstractItemModel::modelAboutToBeReset, this, [d]() {
+        d->slotModelAboutToBeReset();
+    });
+    d->m_viewModelResetConnection = connect(d->m_selectionModel->model(), &QAbstractItemModel::modelReset, this, [d]() {
+        d->slotModelReset();
+    });
+}
+
+QAbstractItemView *KViewStateMaintainerBase::view() const
+{
+    Q_D(const KViewStateMaintainerBase);
+    if (d->m_view.isNull()) {
+        return nullptr;
+    }
+    return d->m_view.data();
+}
+
+void KViewStateMaintainerBase::setView(QAbstractItemView *view)
+{
+    Q_D(KViewStateMaintainerBase);
+    if (view == d->m_view) {
+        return;
+    }
+
+    d->m_view = view;
+
+    if (d->m_selectionModel && d->m_selectionModel->model()) {
+        disconnect(d->m_viewModelAboutToBeResetConnection);
+        disconnect(d->m_viewModelResetConnection);
+    }
+
+    if (d->m_view && d->m_view->model()) {
+        d->m_selectionModelAboutToBeResetConnection = connect(d->m_view->model(), &QAbstractItemModel::modelAboutToBeReset, this, [d]() {
+            d->slotModelAboutToBeReset();
+        });
+        d->m_selectionModelResetConnection = connect(d->m_view->model(), &QAbstractItemModel::modelReset, this, [d]() {
+            d->slotModelReset();
+        });
+    }
+}
+
+#include "moc_kviewstatemaintainerbase.cpp"