Marco Trevisan (Treviño) 6baf82eb83 messageList: stop syncing if closeButton has been destroyed
The _sync function for Message only updates the close button visibility,
so we can safely stop doing that if the close button get get destroyed earlier
(as it happens when clicking on it).

https://bugzilla.gnome.org/show_bug.cgi?id=791233


(cherry picked from commit 87da623d86323a0744b8723e1991f053586defaf)
2018-09-03 23:38:47 +00:00
..