public void deRegisterCompletionProviders() {
        // scheduleDeferred to ensure editor is initialised before getId is called
        Scheduler.get().scheduleDeferred(() -> {
            delegatingAceCompleter.deRegisterCompletionProviders(getEditorId());
        });
    }
Removes all completion providers specific to this editor instance
stroom-core-client-widget/src/main/java/stroom/editor/client/presenter/AbstractEditorPresenter.java