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-kwindowsystem/source/src/kxcbevent_p.h

@@ -0,0 +1,57 @@
+/*
+    SPDX-FileCopyrightText: 2024 Andreas Hartmetz <ahartmetz@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#pragma once
+
+#include <string.h>
+
+/**
+ * KXcbEvent allocates an xcb event in a 32 bytes large, zero-initialized buffer to avoid
+ * out-of-bounds reads and uninitialized memory reads in xcb_send_event(). According to
+ * XCB documentation, the wire size of all XCB events is 32 bytes, and that many bytes will
+ * be read by xcb_send_event().
+ */
+template<class EventType, bool needsPadding = (sizeof(EventType) < 32)>
+struct KXcbEvent;
+
+template<class EventType>
+class KXcbEvent<EventType, false> : public EventType
+{
+public:
+    inline KXcbEvent()
+    {
+        static_assert(sizeof(*this) == s_evtSize);
+        memset(this, 0, s_evtSize);
+    }
+
+    inline const char *buffer() const
+    {
+        return reinterpret_cast<const char *>(this);
+    }
+
+private:
+    static constexpr size_t s_evtSize = 32;
+};
+
+template<class EventType>
+class KXcbEvent<EventType, true> : public EventType
+{
+public:
+    inline KXcbEvent()
+    {
+        static_assert(sizeof(*this) == s_evtSize);
+        memset(this, 0, s_evtSize);
+    }
+
+    inline const char *buffer() const
+    {
+        return reinterpret_cast<const char *>(this);
+    }
+
+private:
+    static constexpr size_t s_evtSize = 32;
+    char m_filler[s_evtSize - sizeof(EventType)];
+};