Remove AbstractClient plumbing casts in DbusInterface

src/dbusinterface.cpp

@@ -235,16 +235,18 @@ QVariantMap DBusInterface::queryWindowInfo()
     setDelayedReply(true);
     kwinApp()->platform()->startInteractiveWindowSelection(
         [this](AbstractClient *t) {
-            if (auto c = static_cast<AbstractClient *>(t->isClient() ? t : nullptr)) {
-                QDBusConnection::sessionBus().send(m_replyQueryWindowInfo.createReply(clientToVariantMap(c)));
-            } else if (qobject_cast<Unmanaged *>(t)) {
-                QDBusConnection::sessionBus().send(m_replyQueryWindowInfo.createErrorReply(
-                    QStringLiteral("org.kde.KWin.Error.InvalidWindow"),
-                    QStringLiteral("Tried to query information about an unmanaged window")));
-            } else {
+            if (!t) {
                 QDBusConnection::sessionBus().send(m_replyQueryWindowInfo.createErrorReply(
                     QStringLiteral("org.kde.KWin.Error.UserCancel"),
                     QStringLiteral("User cancelled the query")));
+                return;
+            }
+            if (t->isClient()) {
+                QDBusConnection::sessionBus().send(m_replyQueryWindowInfo.createReply(clientToVariantMap(t)));
+            } else {
+                QDBusConnection::sessionBus().send(m_replyQueryWindowInfo.createErrorReply(
+                    QStringLiteral("org.kde.KWin.Error.InvalidWindow"),
+                    QStringLiteral("Tried to query information about an unmanaged window")));
             }
         });
     return QVariantMap{};