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Since Generic editor is used by Language Server which doesn't support filter of completion items, it should provide the capability to filter completion items. See https://github.com/eclipselabs/eclipse-language-service/issues/49 for more information.
Associating completion filters with a given content-type and reusing it in Generic Editor makes total sense.
I'm reducing priority on this one as it seems to me that the issue would rather be fixed on the Language Server side ( https://github.com/Microsoft/vscode/issues/13926 ) and is not really a requirement for Generic Editor to support filtering yet.