When it does not make sense for an editor to span perspectives

Right now, this is a scratch pad to record the idea until I get a chance to write it up properly and blog it.

Editors belong to one ore more editing domains. When editing domains change, editors that are not in the current domain are hidden. Editors may also belong to no editing domain at all, indicating that they are potentially applicable to all editing domains. An example of this might be the text file editor.

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