in a corner case that is used a lot, the internal laptop screen
gets automatically disabled when an external screen is connected.
the only QScreen* available from the QGuiApp gets recycled for the
new screen and there is no signal this switch occurred.
To work around this, as all the view get an expose event when this happen,
monitor the rename of the desktopview's qscreen and manage this separatedly
in the shell.
BUG:373880