graceguo-supercat commented on issue #8060: SIP-23: Persist SQL Lab state in the backend URL: https://github.com/apache/incubator-superset/pull/8060#issuecomment-546670315 1. remove new tab will cause server-side error:  2. there is a polling request to backend at the rate of 1 per second, even no active running/pending queries.  3. duplicated preview tabs: <img width="842" alt="Screen Shot 2019-10-27 at 12 36 45 AM" src="https://user-images.githubusercontent.com/27990562/67631365-8d1cea80-f852-11e9-8757-c2cbfe0fed47.png";> <img width="313" alt="Screen Shot 2019-10-27 at 12 37 14 AM" src="https://user-images.githubusercontent.com/27990562/67631360-7aa2b100-f852-11e9-9826-94e1b47ea2ef.png";>
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