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-kio/source/src/filewidgets/kfilepreviewgenerator.h

@@ -0,0 +1,113 @@
+/*
+    SPDX-FileCopyrightText: 2008-2009 Peter Penz <peter.penz@gmx.at>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#ifndef KFILEPREVIEWGENERATOR_H
+#define KFILEPREVIEWGENERATOR_H
+
+#include "kiofilewidgets_export.h"
+
+#include <QObject>
+
+#include <memory>
+
+class KAbstractViewAdapter;
+class KDirModel;
+class QAbstractItemView;
+class QAbstractProxyModel;
+
+class KFilePreviewGeneratorPrivate;
+
+/**
+ * @class KFilePreviewGenerator kfilepreviewgenerator.h <KFilePreviewGenerator>
+ *
+ * @brief Generates previews for files of an item view.
+ *
+ * Per default a preview is generated for each item.
+ * Additionally the clipboard is checked for cut items.
+ * The icon state for cut items gets dimmed automatically.
+ *
+ * The following strategy is used when creating previews:
+ * - The previews for currently visible items are created before
+ *   the previews for invisible items.
+ * - If the user changes the visible area by using the scrollbars,
+ *   all pending previews get paused. As soon as the user stays
+ *   on the same position for a short delay, the previews are
+ *   resumed. Also in this case the previews for the visible items
+ *   are generated first.
+ *
+ */
+class KIOFILEWIDGETS_EXPORT KFilePreviewGenerator : public QObject
+{
+    Q_OBJECT
+
+public:
+    /**
+     * @param parent  Item view containing the file items where previews should
+     *                be generated. It is mandatory that the item view specifies
+     *                an icon size by QAbstractItemView::setIconSize() and that
+     *                the model of the view (or the source model of the proxy model)
+     *                is an instance of KDirModel. Otherwise no previews will be generated.
+     */
+    KFilePreviewGenerator(QAbstractItemView *parent);
+
+    /** @internal */
+    KFilePreviewGenerator(KAbstractViewAdapter *parent, QAbstractProxyModel *model);
+
+    ~KFilePreviewGenerator() override;
+
+    /**
+     * If \a show is set to true, a preview is generated for each item. If \a show
+     * is false, the MIME type icon of the item is shown instead. Per default showing
+     * the preview is turned on. Note that it is mandatory that the item view
+     * specifies an icon size by QAbstractItemView::setIconSize(), otherwise
+     * KFilePreviewGenerator::isPreviewShown() will always return false.
+     */
+    void setPreviewShown(bool show);
+    bool isPreviewShown() const;
+
+    /**
+     * Sets the list of enabled thumbnail plugins.
+     * Per default all plugins enabled in the KConfigGroup "PreviewSettings"
+     * are used.
+     *
+     * Note that this method doesn't cause already generated previews
+     * to be regenerated.
+     *
+     * For a list of available plugins, call KIO::PreviewJob::availableThumbnailerPlugins().
+     *
+     * @see enabledPlugins
+     */
+    void setEnabledPlugins(const QStringList &list);
+
+    /**
+     * Returns the list of enabled thumbnail plugins.
+     * @see setEnabledPlugins
+     */
+    QStringList enabledPlugins() const;
+
+public Q_SLOTS:
+    /**
+     * Updates the icons for all items. Usually it is only
+     * necessary to invoke this method when the icon size of the abstract item view
+     * has been changed by QAbstractItemView::setIconSize(). Note that this method
+     * should also be invoked if previews have been turned off, as the icons for
+     * cut items must be updated when the icon size has changed.
+     */
+    void updateIcons();
+
+    /** Cancels all pending previews. */
+    void cancelPreviews();
+
+private:
+    friend class KFilePreviewGeneratorPrivate;
+    std::unique_ptr<KFilePreviewGeneratorPrivate> const d;
+
+    Q_DISABLE_COPY(KFilePreviewGenerator)
+
+    Q_PRIVATE_SLOT(d, void pauseIconUpdates())
+};
+
+#endif