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Backport !1009 “gapplication: remove inactivity_timeout source on finalize” to glib-2-60

Philip Withnall requested to merge pwithnall/glib:backport-1009-application-crash-glib-2-60 into glib-2-60

The event source used to handle inactivity_timeout doesn't hold a reference on the application. Therefore, it is possible for callback function of the event source to run after the application has been freed, leading to use-after-free problem. To avoid the problem, we should remove the event source before the application is freed.

This should fix SIGBUS crash of gio/tests/gapplication on FreeBSD. #1846 (comment 566550)

Trivial backport of !1009 (merged) to glib-2-60.

Edited by Philip Withnall

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