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/breadcrumbnavigationwidget.h

@@ -0,0 +1,100 @@
+/*
+    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
+*/
+
+#ifndef BREADCRUMBNAVIGATION_WIDGET_H
+#define BREADCRUMBNAVIGATION_WIDGET_H
+
+#include "klinkitemselectionmodel.h"
+#include <kselectionproxymodel.h>
+
+#include <QItemSelection>
+#include <QLabel>
+#include <QWidget>
+
+class CurrentItemLabel : public QLabel
+{
+    Q_OBJECT
+public:
+    CurrentItemLabel(QAbstractItemModel *model, QWidget *parent = nullptr, Qt::WindowFlags f = Qt::WindowFlags());
+
+private Q_SLOTS:
+    void rowsInserted(const QModelIndex &parent, int start, int end);
+    void rowsRemoved(const QModelIndex &parent, int start, int end);
+    void dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight);
+    void modelReset();
+
+private:
+    QAbstractItemModel *m_model;
+};
+
+class KBreadcrumbNavigationProxyModel : public KSelectionProxyModel
+{
+    Q_OBJECT
+public:
+    KBreadcrumbNavigationProxyModel(QItemSelectionModel *selectionModel, QObject *parent = nullptr);
+
+    void setShowHiddenAscendantData(bool showHiddenAscendantData);
+    bool showHiddenAscendantData() const;
+
+    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
+
+private:
+    bool m_showHiddenAscendantData;
+};
+
+class KNavigatingProxyModel : public KSelectionProxyModel
+{
+    Q_OBJECT
+public:
+    KNavigatingProxyModel(QItemSelectionModel *selectionModel, QObject *parent = nullptr);
+
+    void setSourceModel(QAbstractItemModel *sourceModel) override;
+
+    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
+
+private Q_SLOTS:
+    void modelReset();
+    void updateNavigation();
+    void navigationSelectionChanged(const QItemSelection &, const QItemSelection &);
+
+private:
+private:
+    using KSelectionProxyModel::setFilterBehavior;
+
+    QItemSelectionModel *m_selectionModel;
+};
+
+class KForwardingItemSelectionModel : public QItemSelectionModel
+{
+    Q_OBJECT
+public:
+    enum Direction {
+        Forward,
+        Reverse,
+    };
+    KForwardingItemSelectionModel(QAbstractItemModel *model, QItemSelectionModel *selectionModel, QObject *parent = nullptr);
+    KForwardingItemSelectionModel(QAbstractItemModel *model, QItemSelectionModel *selectionModel, Direction direction, QObject *parent = nullptr);
+
+    void select(const QModelIndex &index, SelectionFlags command) override;
+    void select(const QItemSelection &selection, SelectionFlags command) override;
+
+private Q_SLOTS:
+    void navigationSelectionChanged(const QItemSelection &selected, const QItemSelection &deselected);
+
+private:
+    QItemSelectionModel *m_selectionModel;
+    Direction m_direction;
+};
+
+class BreadcrumbNavigationWidget : public QWidget
+{
+    Q_OBJECT
+public:
+    BreadcrumbNavigationWidget(QWidget *parent = nullptr, Qt::WindowFlags f = Qt::WindowFlags());
+};
+
+#endif