So, as part of the screens initialization, the
QWindowSystemInterface::handleScreenAdded function calls `emit
qGuiApp->screenAdded(screen)`.

But then in the signal processing code, the sender of the signal is
null. In our case, the sender is `qGuiApp`, which is a #define for
`static_cast<QGuiApplication *>(QCoreApplication::instance())`.

I don’t understand why it happens. This can have different causes, from
multi-threading issues to memory corruption.

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https://bugs.launchpad.net/bugs/2078732

Title:
  Segmentation Fault on Kubuntu 24.10

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