The ShouldLoad() signal is handled by flush_pending(). This is the first
time that normal application flow can be interrupted in ::starting()
after app->ready().
This calls ::load_from_application_api(), which in turn calls
startup_fsm->handle_path(). This sets off the complete initalization
process, loading the session, and concludes with ::sfsm_response(),
where there is a call to `delete startup_fsm;`
Previously execution continued in StartupFSM::start() which caused a
crash.
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