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goaproviderdialog: fix deadlock with cancelled tasks

Andy Holmes requested to merge andyholmes/gnome-46-backports into gnome-46

The task cancellable is watched so that the dialog can be closed if cancelled, but the cancellable was disconnected in its own handler resulting in a deadlock.

Check if the task has been cancelled before disconnecting and, if so, defer disconnecting until dispose().

closes #379 (closed)

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