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/tests/blurbehindtest.cpp

@@ -0,0 +1,122 @@
+/*
+    This file is part of the KDE libraries
+    SPDX-FileCopyrightText: 2013 Nicolás Alvarez <nicolas.alvarez@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.1-or-later
+*/
+
+#include <QApplication>
+#include <QPushButton>
+#include <QVBoxLayout>
+#include <QWidget>
+
+#include <kwindoweffects.h>
+
+class BlurTestWindow : public QWidget
+{
+public:
+    BlurTestWindow();
+
+    void resizeEvent(QResizeEvent *) override;
+
+private:
+    QPushButton *m_btnNothing;
+    QPushButton *m_btnFullWindow;
+    QPushButton *m_btnRect;
+    QPushButton *m_btnEllipse;
+    QWidget *m_area;
+
+    enum { Nothing, FullWindow, Rect, Ellipse } m_state;
+
+    void setWindowAlpha(int alpha);
+
+    void disableBlur();
+    void enableBlur();
+    void enableBlurRect();
+    void enableBlurEllipse();
+};
+
+BlurTestWindow::BlurTestWindow()
+{
+    m_state = Nothing;
+    setAttribute(Qt::WA_TranslucentBackground);
+    setAttribute(Qt::WA_NoSystemBackground, false);
+    setWindowAlpha(192);
+
+    m_btnNothing = new QPushButton("Nothing");
+    m_btnFullWindow = new QPushButton("Full window");
+    m_btnRect = new QPushButton("Rectangle");
+    m_btnEllipse = new QPushButton("Ellipse");
+
+    m_area = new QWidget;
+    m_area->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
+
+    connect(m_btnNothing, &QPushButton::clicked, this, &BlurTestWindow::disableBlur);
+    connect(m_btnFullWindow, &QPushButton::clicked, this, &BlurTestWindow::enableBlur);
+    connect(m_btnRect, &QPushButton::clicked, this, &BlurTestWindow::enableBlurRect);
+    connect(m_btnEllipse, &QPushButton::clicked, this, &BlurTestWindow::enableBlurEllipse);
+
+    QVBoxLayout *layout = new QVBoxLayout(this);
+    layout->addWidget(m_btnNothing);
+    layout->addWidget(m_btnFullWindow);
+    layout->addWidget(m_btnRect);
+    layout->addWidget(m_btnEllipse);
+    layout->addWidget(m_area);
+
+    winId(); // force creation of the associated window
+}
+
+void BlurTestWindow::disableBlur()
+{
+    m_state = Nothing;
+    KWindowEffects::enableBlurBehind(windowHandle(), false);
+    repaint();
+}
+void BlurTestWindow::enableBlur()
+{
+    m_state = FullWindow;
+    KWindowEffects::enableBlurBehind(windowHandle(), true);
+    repaint();
+}
+void BlurTestWindow::enableBlurRect()
+{
+    m_state = Rect;
+    QRegion rgn(m_area->geometry());
+    KWindowEffects::enableBlurBehind(windowHandle(), true, rgn);
+    repaint();
+}
+void BlurTestWindow::enableBlurEllipse()
+{
+    m_state = Ellipse;
+    QRegion rgn(m_area->geometry(), QRegion::Ellipse);
+    KWindowEffects::enableBlurBehind(windowHandle(), true, rgn);
+    repaint();
+}
+
+void BlurTestWindow::resizeEvent(QResizeEvent *)
+{
+    if (m_state == Rect) {
+        enableBlurRect();
+    } else if (m_state == Ellipse) {
+        enableBlurEllipse();
+    }
+}
+
+void BlurTestWindow::setWindowAlpha(int alpha)
+{
+    QPalette pal = this->palette();
+    QColor windowColor = pal.color(QPalette::Window);
+    windowColor.setAlpha(alpha);
+    pal.setColor(QPalette::Window, windowColor);
+    this->setPalette(pal);
+}
+
+int main(int argc, char **argv)
+{
+    QApplication app(argc, argv);
+
+    BlurTestWindow wnd;
+    wnd.show();
+
+    return app.exec();
+}