rjurney opened a new pull request #7419: Fixes missing download from Dashboard 
Export Action
URL: https://github.com/apache/incubator-superset/pull/7419
 
 
   ### CATEGORY
   
   Choose one
   
   - [x] Bug Fix
   - [ ] Enhancement (new features, refinement)
   - [ ] Refactor
   - [ ] Add tests
   - [ ] Build / Development Environment
   - [ ] Documentation
   
   ### SUMMARY
   
   Strangely `window.open` followed by changing `window.location` in the export 
dashboard page stopped working a few months ago, possibly because of changes in 
browser behavior. This resulted in the Dashboard export action failing. My fix 
is to build a link and click it, which does work consistently.
   
   The related Python code is here: 
https://github.com/apache/incubator-superset/blob/master/superset/views/core.py#L675-L696
 but this seems purely a Javascript issue.
   
   ### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
   <!--- Skip this if not applicable -->
   
   ### TEST PLAN
   <!--- What steps should be taken to verify the changes -->
   I personally verified that this works but am not aware of a unit test for 
this function.
   
   ### ADDITIONAL INFORMATION
   <!--- Check any relevant boxes with "x" -->
   <!--- HINT: Include "Fixes #nnn" if you are fixing an existing issue -->
   - [x] Has associated issue: #7353 
   - [ ] Changes UI
   - [ ] Requires DB Migration.
   - [ ] Confirm DB Migration upgrade and downgrade tested.
   - [ ] Introduces new feature or API
   - [ ] Removes existing feature or API
   
   ### REVIEWERS
   
   @mistercrunch 

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