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Removing event listeners on the resolver can result in recursive calls to BrowseService.Dispose(), caused by signals being dispatched inside `resolver.Failure -= OnResolveFailure', rendering the atomicity guaranteed by the lock (this) block ineffective. This commit fortifies BrowseService and ServiceBrowser from this: - BrowseService.Dispose() will not call DisposeResolver() when already disposed. - BrowseService.DisposeResolver() will nullify this.resolver before performing cleanup on the resolver. - ServiceBrowser.OnItemNew() will replace the service entry in its services dictionary with the new service before disposing of the old one. - ServiceBrowser.OnItemRemoved() will remove the service entry from its services dictionary before running Dispose() on it, thus preventing recursive Dispose() calls.
Dispose methods of IDisposable objects are should be able to be called more than once, so avoid doing anything after the first time.
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This branch fixes a crasher in Banshee when a DAAP service disappears on Ubuntu, as shown on https://bugzilla.gnome.org/show_bug.cgi?id=662309.