[document-store] Defer listener to fix issue with stalled requests #990
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For some reason the listener requests coming from the QueryContainer component were not disposed properly, causing old eventsource requests to stay open even though they should have been unsubscribed/cancelled. I don't have a clear idea exactly why that happens, but at least deferring the query until subscription time fixes the issue for now.
This is a semi-critical issue, so I'll do a patch release right after merge.