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Aron Helser authored
Add a `resourcesToExpunge` item to the `Result` attribute of operations, and have the `Operation` base class remove resources from the resource manager after operation observers have run, and before releasing resource locks, to avoid conflicts. Rework the `RemoveResource` operation to use this mechanism, and have `File .. Close Resource` use this operation instead of closing resources directly. Because `Operation` now accesses the resource manager, there is no need for the `ResourceManagerOperation` sub-class, so alias it to `XMLOperation`.
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