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/tests/waylandservertest.cpp

@@ -0,0 +1,112 @@
+/*
+    SPDX-FileCopyrightText: 2014 Martin Gräßlin <mgraesslin@kde.org>
+
+    SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
+*/
+#include "wayland/compositor.h"
+#include "wayland/display.h"
+#include "wayland/output.h"
+#include "wayland/seat.h"
+#include "wayland/xdgshell.h"
+
+#include "fakeoutput.h"
+
+#include <QFile>
+#include <QGuiApplication>
+#include <private/qeventdispatcher_glib_p.h>
+
+#include <iostream>
+#include <sys/select.h>
+#include <unistd.h>
+
+static int startXServer()
+{
+    const QByteArray process = QByteArrayLiteral("Xwayland");
+    int pipeFds[2];
+    if (pipe(pipeFds) != 0) {
+        std::cerr << "FATAL ERROR failed to create pipe to start X Server " << process.constData() << std::endl;
+        exit(1);
+    }
+
+    pid_t pid = fork();
+    if (pid == 0) {
+        // child process - should be turned into Xwayland
+        // writes to pipe, closes read side
+        close(pipeFds[0]);
+        char fdbuf[16];
+        sprintf(fdbuf, "%d", pipeFds[1]);
+        execlp(process.constData(), process.constData(), "-displayfd", fdbuf, (char *)nullptr);
+        close(pipeFds[1]);
+        exit(20);
+    }
+    // parent process - this is the wayland server
+    // reads from pipe, closes write side
+    close(pipeFds[1]);
+    return pipeFds[0];
+}
+
+static void readDisplayFromPipe(int pipe)
+{
+    QFile readPipe;
+    if (!readPipe.open(pipe, QIODevice::ReadOnly)) {
+        std::cerr << "FATAL ERROR failed to open pipe to start X Server XWayland" << std::endl;
+        exit(1);
+    }
+    QByteArray displayNumber = readPipe.readLine();
+
+    displayNumber.prepend(QByteArray(":"));
+    displayNumber.remove(displayNumber.size() - 1, 1);
+    std::cout << "X-Server started on display " << displayNumber.constData() << std::endl;
+
+    setenv("DISPLAY", displayNumber.constData(), true);
+
+    // close our pipe
+    close(pipe);
+}
+
+int main(int argc, char **argv)
+{
+    using namespace KWin;
+
+    // set our own event dispatcher to be able to dispatch events before the event loop is started
+    QAbstractEventDispatcher *eventDispatcher = new QEventDispatcherGlib();
+    QCoreApplication::setEventDispatcher(eventDispatcher);
+
+    // first create the Server and setup with minimum to get an XWayland connected
+    KWin::Display display;
+    display.start();
+    display.createShm();
+    new CompositorInterface(&display, &display);
+    new XdgShellInterface(&display, &display);
+
+    auto outputHandle = std::make_unique<FakeOutput>();
+    outputHandle->setMode(QSize(1024, 768), 60000);
+    outputHandle->setPhysicalSize(QSize(10, 10));
+
+    auto outputInterface = std::make_unique<OutputInterface>(&display, outputHandle.get());
+
+    // starts XWayland by forking and opening a pipe
+    const int pipe = startXServer();
+    if (pipe == -1) {
+        exit(1);
+    }
+
+    fd_set rfds;
+    struct timeval tv;
+    tv.tv_sec = 0;
+    tv.tv_usec = 0;
+    do {
+        eventDispatcher->processEvents(QEventLoop::WaitForMoreEvents);
+        FD_ZERO(&rfds);
+        FD_SET(pipe, &rfds);
+    } while (select(pipe + 1, &rfds, nullptr, nullptr, &tv) == 0);
+
+    // now Xwayland is ready and we can read the pipe to get the display
+    readDisplayFromPipe(pipe);
+
+    QGuiApplication app(argc, argv);
+
+    new SeatInterface(&display, QStringLiteral("testSeat0"));
+
+    return app.exec();
+}