https://invent.kde.org/plasma/plasma-workspace/-/commit/c7ba560ccaac5e469cb2d6bf66c39e1acf967454
https://mail.kde.org/pipermail/distributions/2022-September/001287.html

From: Nicolas Fella <nicolas.fella@gmx.de>
Date: Sun, 21 Aug 2022 16:33:50 +0200
Subject: [PATCH] [widgetexplorer] Don't recurse into applet's containments

The intention of this code appears to be finding system tray applets, since the systemtray is a containment within another applet/containment

However the code causes an infinit recursion since we are calling addContainment on the same containment again

The recursion also is unnecessary since corona->containments() already lists the system tray containment, so we don't need to find it by recursing through the panel's children
--- a/components/shellprivate/widgetexplorer/widgetexplorer.cpp
+++ b/components/shellprivate/widgetexplorer/widgetexplorer.cpp
@@ -280,10 +280,6 @@ void WidgetExplorerPrivate::addContainment(Containment *containment)
 
     foreach (Applet *applet, containment->applets()) {
         if (applet->pluginMetaData().isValid()) {
-            Containment *childContainment = applet->property("containment").value<Containment *>();
-            if (childContainment) {
-                addContainment(childContainment);
-            }
             runningApplets[applet->pluginMetaData().pluginId()]++;
         } else {
             qDebug() << "Invalid plugin metadata. :(";
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