Fix: blur background window probably shows icon in the taskbar on X11

src/tablet_manager.cpp

@@ -50,6 +50,7 @@ TabletManager::TabletManager(QObject *parent)
 {
     m_existTabletDesktop = QFile::exists(QStringLiteral("/usr/bin/ukui-tablet-desktop"));
     if (kwinApp()->operationMode() == Application::OperationMode::OperationModeX11) {
+        m_background->setState(NET::SkipTaskbar | NET::SkipPager | NET::SkipSwitcher);
         // TODO: 在这块如果不设置窗口可见和背景模糊的话，X 下无法创建成功窗口并受窗管控制
         m_background->show();
         // KWindowEffects::enableBlurBehind(m_background->windowHandle(), true);
@@ -291,6 +292,12 @@ void TabletBackground::init()
     connect(screens(), &Screens::geometryChanged, this, &TabletBackground::slotGeometryChanged);
 }
 
+void TabletBackground::setState(NET::States state)
+{
+    NETWinInfo info(QX11Info::connection(), winId(), QX11Info::appRootWindow(), NET::Properties(), NET::Properties2());
+    info.setState(state, state);
+}
+
 void TabletBackground::paintEvent(QPaintEvent *event)
 {
     Q_UNUSED(event);
@@ -365,14 +372,11 @@ void SingleWindowManager::setBlurBackground(TabletBackground *blurBackground)
             for (int i = stacking_order.count() - 1; i > -1; --i) {
                 AbstractClient *c = qobject_cast<AbstractClient*>(stacking_order.at(i));
                 if (c && c->keepBelow() && c->caption().contains("tablet_blur_background")) {
+                    // only on X11
                     m_blurHelperWindow = c;
                     // 设置毛玻璃背景窗口为全屏，防止在updateClientArea()->checkWorkspacePosition()时毛玻璃窗口被修改位置
                     m_blurHelperWindow->setFullScreen(true, false);
-                    // only on X11
                     m_blurHelperWindow->setDisableActive();
-                    m_blurHelperWindow->setSkipSwitcher(true);
-                    m_blurHelperWindow->setSkipPager(true);
-                    m_blurHelperWindow->setOriginalSkipTaskbar(true);
                     m_blurHelperWindow->minimize(true);
                     connect(Compositor::self(), &Compositor::compositingToggled, [this](bool active){
                         if (active) {

src/tablet_manager.h

@@ -10,6 +10,7 @@
 #include <kwin_export.h>
 #include <config-kwin.h>
 #include <kwinglobals.h>
+#include <netwm.h>
 #include <QVector>
 #include <QWidget>
 
@@ -29,6 +30,8 @@ public:
 
     void init();
     void autoHide(bool on);
+    // only on X11
+    void setState(NET::States state);
 
 protected:
     void paintEvent(QPaintEvent *event) override;