NaukhaizAhmad opened a new issue #4611: [Slice] 'Visualization Type' should display the drop down (listing all the visualization types) rather than displaying an editable string field. URL: https://github.com/apache/incubator-superset/issues/4611 ### Superset version 0.22.1 ### Expected results A drop down list should be available, or a non-editable field. ### Actual results An editable field is available against the visualization type. And as a result user can edit the visualization type with a valid/invalid type. ### Steps to reproduce go to slices list open the edit slice link from any of the listed/created slice the visualization type field would be displaying a string editable field. It should display a drop down, listing all the visualization types for restricting the end user to select from the drop down list. Rather than allowing the user to type any string (may be valid or invalid) Because in case of an invalid visualization type, slice and dashboard containing this slice won't load properly. screen shot is attached. 
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