[kde] [Bug 466914] Kded5 crash when switchin between monitor and tv

[Luca Bacci]

https://bugs.kde.org/show_bug.cgi?id=466914

--- Comment #6 from Luca Bacci <luca.bacci at outlook.com> ---
Thanks for the report, Bucior!

Seems to be a different issue according to the stacktrace, most probably in
KScreen. The stacktrace is very useful! :)

KScreen::Osd keeps a reference to a LibKScreen::Output. When Osd instances are
destroyed, their references to LibKScreen::Output instances are dropped, and
that can cause their immediate destruction.

Osd also subscribes as an observeer for its member LibKScreen::Output's
destruction:
https://invent.kde.org/plasma/kscreen/-/blob/v5.27.2/osd/osd.cpp#L33. The
handler method is Osd::hideOsd() is executed, but at that time Osd is already
in the process of being destructed...

As for fixes, we may ::disconnect() in Osd's destructor. However I don't get
why Osd observes its member object for destruction if it keeps a reference to
it?

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