b5d3c4e165
The theme widget passed to shell_tray_manager_manager_screen() is simply a means to receive style information. There is nothing which ties the two object's life cycles together, so it is entirely possible for the tray to be finalized with the widget still around - we shouldn't try to update the stale object on widget style changes, so make sure we properly disconnect the signal handler. https://bugzilla.gnome.org/show_bug.cgi?id=786526
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