Using Field-Grid-Dropdown and Field-Colour Plugins together with Blockly v12

[mariopesch]

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Component

@blockly/field-colour and @blockly/field-grid-dropdown

Description

After updating Blockly to v12 and bumping the Plugins to the newest Versions i ran into the error that the @blockly/field-colour and @blockly/field-grid-dropdown Plugins can't be used at the same time.

I first noticed in our React-Blockly App for the senseBox and reproduced the error in a "clean" new Project (https://github.com/mariopesch/spockly-demo/tree/feat/add-webR) -> mariopesch/spockly-demo@8238c27

This is the deploy preview of the PR: https://deploy-preview-1--spockly-demo.netlify.app/

The error seems to be a double registration of the field

Error: Name "field_grid_dropdown" with type "field" already registered. 

Reproduction steps

1. Install both Plugins :
   @blockly/field-grid-dropdown
   @blockly/field-colour
2. Include both Block examples from the Plugin page and add to the Toolbox
3. Try to start the Application

Stack trace

chunk-KYQBFAAT.js?v=ee314035:28 Uncaught Error: Name "field_grid_dropdown" with type "field" already registered.
 at register$$module$build$src$core$registry (chunk-KYQBFAAT.js?v=ee314035:28:45)
 at Object.register$$module$build$src$core$field_registry [as register] (chunk-KYQBFAAT.js?v=ee314035:2525:9)
 at @blockly_field-colour.js?v=ee314035:237:35
 at o2 (@blockly_field-colour.js?v=ee314035:238:11)
 at 462 (@blockly_field-colour.js?v=ee314035:238:28)
 at c (@blockly_field-colour.js?v=ee314035:250:22)
 at @blockly_field-colour.js?v=ee314035:269:31
 at @blockly_field-colour.js?v=ee314035:590:9
 at @blockly_field-colour.js?v=ee314035:591:7
 at @blockly_field-colour.js?v=ee314035:19:85

Screenshots

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