fix: init showingDesktop for smart Hide.

as title.

Logs:

Author: wjyrich

panels/dock/x11dockhelper.cpp

@@ -16,6 +16,8 @@
 #include <QGuiApplication>
 #include <QPointer>
 #include <QDBusConnection>
+#include <QDBusInterface>
+#include <QDBusReply>
 
 namespace dock {
 Q_LOGGING_CATEGORY(dockX11Log, "dde.shell.dock.x11")
@@ -628,7 +630,12 @@ void X11DockWakeUpArea::updateDockWakeArea(Position pos)
 
 void X11DockHelper::setupKWinDBusConnection()
 {
-    // 连接到 KWin 的 D-Bus 接口监听 showingDesktopChanged 信号
+    QDBusInterface kwin("org.kde.KWin", "/KWin", "org.kde.KWin", QDBusConnection::sessionBus());
+    if (kwin.isValid()) {
+        QVariant property = kwin.property("showingDesktop");
+        m_showingDesktop = property.toBool();
+    }
+
     QDBusConnection::sessionBus().connect(
         "org.kde.KWin",                    
         "/KWin",