Bug 455879

Hello,

Since a few days (mid-june 2022) sometime it happens that a window in a virtual desktop A is printed when switching to virtual desktop B. Not easy to reproduce manually. May stop after some times or changing to any visual effect when switching virt desktop.

Error that may be relevant (or not i'm not sure) on my journalctl I've seen:

```
juin 24 10:36:38 arthurp systemsettings5[44676]: file:///usr/share/kpackage/kcms/kcm_desktoptheme/contents/ui/main.qml:58:14: QML RowLayout: Cannot anchor to an item that isn't a parent or sibling.
juin 24 10:36:39 arthurp systemsettings5[44676]: QQmlEngine::setContextForObject(): Object already has a QQmlContext
juin 24 10:36:39 arthurp systemsettings5[44676]: file:///usr/lib/qt/qml/org/kde/kirigami.2/PlaceholderMessage.qml:235:5: QML Heading: Binding loop detected for property "verticalAlignment"
juin 24 10:36:39 arthurp systemsettings5[44676]: file:///usr/lib/qt/qml/org/kde/kcm/AbstractKCM.qml:60:13: QML Control: Binding loop detected for property "implicitHeight"
juin 24 10:36:39 arthurp systemsettings5[44676]: file:///usr/share/kpackage/kcms/kcm_colors/contents/ui/main.qml:293:25: Unable to assign [undefined] to bool
juin 24 10:36:39 arthurp systemsettings5[44676]: file:///usr/share/kpackage/kcms/kcm_colors/contents/ui/main.qml:85:13: QML ColumnLayout: Cannot anchor to an item that isn't a parent or sibling.


juin 24 10:37:02 arthurp kwin_x11[9424]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 23212, resource id: 19070799, major code: 3 (GetWindowAttributes), minor code: 0
juin 24 10:37:02 arthurp kwin_x11[9424]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 23213, resource id: 19070799, major code: 14 (GetGeometry), minor code: 0
```

I'll keep an eye on it to see if I can reproduce it or find a more accurage log.