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/kwin/source/src/placement.h

@@ -0,0 +1,76 @@
+/*
+    KWin - the KDE window manager
+    This file is part of the KDE project.
+
+    SPDX-FileCopyrightText: 1999, 2000 Matthias Ettrich <ettrich@kde.org>
+    SPDX-FileCopyrightText: 1997-2002 Cristian Tibirna <tibirna@kde.org>
+    SPDX-FileCopyrightText: 2003 Lubos Lunak <l.lunak@kde.org>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
+
+#pragma once
+// KWin
+#include "options.h"
+// Qt
+#include <QList>
+#include <QPoint>
+#include <QRect>
+
+namespace KWin
+{
+
+class VirtualDesktop;
+class Window;
+
+class KWIN_EXPORT Placement
+{
+public:
+    explicit Placement();
+
+    bool place(Window *c, const QRectF &area);
+    bool placeSmart(Window *c, const QRectF &area, PlacementPolicy next = PlacementUnknown);
+
+    bool placeCentered(Window *c, const QRectF &area, PlacementPolicy next = PlacementUnknown);
+
+    void reinitCascading();
+    void reinitCascading(VirtualDesktop *desktop);
+
+    QRectF cascadeIfCovering(Window *c, const QRectF &geometry, const QRectF &area) const;
+
+    /**
+     * Cascades all clients on the current desktop
+     */
+    void cascadeDesktop();
+    /**
+     *   Unclutters the current desktop by smart-placing all clients again.
+     */
+    void unclutterDesktop();
+
+    static const char *policyToString(PlacementPolicy policy);
+
+private:
+    bool place(Window *c, const QRectF &area, PlacementPolicy policy, PlacementPolicy nextPlacement = PlacementUnknown);
+    bool placeUnderMouse(Window *c, const QRect &area, PlacementPolicy next = PlacementUnknown);
+    bool placeOnMainWindow(Window *c, const QRect &area, PlacementPolicy next = PlacementUnknown);
+    bool placeTransient(Window *c);
+    bool placeAtRandom(Window *c, const QRect &area, PlacementPolicy next = PlacementUnknown);
+    bool placeCascaded(Window *c, const QRect &area, PlacementPolicy next = PlacementUnknown);
+    bool placeMaximizing(Window *c, const QRect &area, PlacementPolicy next = PlacementUnknown);
+    bool placeZeroCornered(Window *c, const QRect &area, PlacementPolicy next = PlacementUnknown);
+    bool placeDialog(Window *c, const QRect &area, PlacementPolicy next = PlacementUnknown);
+    bool placeUtility(Window *c, const QRect &area, PlacementPolicy next = PlacementUnknown);
+    bool placeOnScreenDisplay(Window *c, const QRect &area);
+
+    // CT needed for cascading+
+    struct DesktopCascadingInfo
+    {
+        QPoint pos;
+        int col;
+        int row;
+    };
+
+    QHash<VirtualDesktop *, DesktopCascadingInfo> cci;
+};
+
+} // namespace