[GitHub] [incubator-superset] dpgaspar opened a new pull request #7326: [annotations] Improves annotation validation, start_dttm, end_dttm

[GitBox <gi...@apache.org>]

dpgaspar opened a new pull request #7326: [annotations] Improves annotation validation, start_dttm, end_dttm
URL: https://github.com/apache/incubator-superset/pull/7326
 
 
   ### CATEGORY
   
   Choose one
   
   - [x] Enhancement (new features, refinement)
   
   ### SUMMARY
   Annotations are using ``pre_add`` callback to validate form fields, the users need to refill the form
   if ``start_dttm`` and/or ``end_dttm`` validation fails. Using a custom WTForm validation object
   improves the user experience because the form is validated before leaving the page, and 
   fields are highlighted with the error message
   
   
   ### ADDITIONAL INFORMATION
   - [x] Changes UI
   

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