kgabryje opened a new pull request #15740:
URL: https://github.com/apache/superset/pull/15740


   ### SUMMARY
   Implements UX improvements for DnD, some of which are prerequisites for drag 
and dropping time columns.
   Changes include:
   - sorting columns in dataset panel so that temporal columns are displayed 
first (so that it's easy find them and drag to time column control)
   - making delete button in `DndColumnSelect` configurable - we don't display 
the delete button for time column control
   - changed logic of `canDrop` on single selection controls. Before in order 
to change the selection, user had to remove current selection and drop a new 
column/metric. Now when control field has a value, user can just drop a new 
value and it will get swapped
   
   ### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
   
https://user-images.githubusercontent.com/15073128/125949640-faa0f395-91dd-4cc2-baec-822ac48bbe8d.mov
   
   ### TESTING INSTRUCTIONS
   Instructions for changes related to time column dnd will be described in a 
PR in superset-ui
   To test the new behaviour of single select controls:
   0. Set `ENABLE_EXPLORE_DRAG_AND_DROP` to True
   1. Open a chart that has controls that accept only a single value, e.g. 
Chord chart.
   2. Add values to control fields, then swap them without removing first
   
   ### ADDITIONAL INFORMATION
   <!--- Check any relevant boxes with "x" -->
   <!--- HINT: Include "Fixes #nnn" if you are fixing an existing issue -->
   - [ ] Has associated issue:
   - [ ] Changes UI
   - [ ] Includes DB Migration (follow approval process in 
[SIP-59](https://github.com/apache/superset/issues/13351))
     - [ ] Migration is atomic, supports rollback & is backwards-compatible
     - [ ] Confirm DB migration upgrade and downgrade tested
     - [ ] Runtime estimates and downtime expectations provided
   - [ ] Introduces new feature or API
   - [ ] Removes existing feature or API
   
   CC @junlincc 


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