[GitHub] [incubator-superset] graceguo-supercat opened a new pull request #11220: feat: prevent co-edit dashboard collision

[GitBox]

graceguo-supercat opened a new pull request #11220:
URL: https://github.com/apache/incubator-superset/pull/11220


   ### SUMMARY
   <!--- Describe the change below, including rationale and design decisions -->
   
   ### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
   **BEFORE:**
   2nd edit override first edit quietly.
   
   **AFTER:**
   2nd edit could not be saved, and dashboard show error message:
   <img width="1252" alt="Screen Shot 2020-10-09 at 11 12 55 AM" 
src="https://user-images.githubusercontent.com/27990562/95617657-a0ec3d00-0a20-11eb-8452-04abdd2b3d9d.png";>
   
   
   ### TEST PLAN
   CI and manual tests.
   
   ### ADDITIONAL INFORMATION
   <!--- Check any relevant boxes with "x" -->
   <!--- HINT: Include "Fixes #nnn" if you are fixing an existing issue -->
   - [ ] Has associated issue:
   - [ ] Changes UI
   - [ ] Requires DB Migration.
   - [ ] Confirm DB Migration upgrade and downgrade tested.
   - [ ] Introduces new feature or API
   - [ ] Removes existing feature or API
   


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