aca340b81090277e1ab4f49bae9dff04fb9c9783
The RouteGroup containing the deleted routes emits the RouteRemoved signal; Session handles this and if the RouteGroup is now empty, deletes the RouteGroup *while in the middle of the signal emission process*. This deletes the Signal (since it was owned by the RouteGroup) which leads to a crash inside the signal emission code, since that is now running "on" a deleted Signal object. This change simply makes that signal static, and so deleting the RouteGroup has no effect on the Signal itself. More changes to come related to better (shared_ptr<RouteGroup>) mgmt of RouteGroup lifetimes.
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