Scope DialogShadows lifetime to application

David Edmundsonrequested to merge
work/exit_crash into master
  • DialogShadows own KWayland::Client::buffer objects
  • Buffer cleanup makes wayland calls
  • wayland calls after QGuiApplication has stoped will fail

Q_GLOBAL_STATIC mangaged objects can outlive the QGuiApplication.

BUG:443706

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