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Now when user switches to another editor, error providers for the previous one still work. This slows down showing errors in the new editor dramatically. When user switches editor, providers that are related with the previous one should be stopped.
It's worth using RequestResponse pattern - see http://wiki.apidesign.org/wiki/APIDesignPatterns:RequestResponse
RequestResponse pattern is used now; The framework is now able to send providers cancel message.
Is it still issue?