[TabBox] Don't show "Show desktop" window when cycling through application windows

When I'm explicitly cycling through the windows of an application it makes no sense to show the "global" desktop window.

BUG: 378662
FIXED-IN: 5.12.0

Differential Revision: https://phabricator.kde.org/D9661

tabbox/clientmodel.cpp

@@ -228,7 +228,8 @@ void ClientModel::createClientList(int desktop, bool partialReset)
         m_clientList.removeAll(c);
         m_clientList.prepend(c);
     }
-    if (tabBox->config().showDesktopMode() == TabBoxConfig::ShowDesktopClient || m_clientList.isEmpty()) {
+    if (tabBox->config().clientApplicationsMode() != TabBoxConfig::AllWindowsCurrentApplication
+            && (tabBox->config().showDesktopMode() == TabBoxConfig::ShowDesktopClient || m_clientList.isEmpty())) {
         QWeakPointer<TabBoxClient> desktopClient = tabBox->desktopClient();
         if (!desktopClient.isNull())
             m_clientList.append(desktopClient);