Since Gutenberg v8.8.0 oik-blocks doesn't list core-embed blocks

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core-embed is not available in Prefix select box. Why not?

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Core embed blocks are now Variations of the core/embed block.
You can use getBlockVariations( state, blockName, scope ) to get the block variations by block name.

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Requirements

The following blocks will need changing to support block variations.

1. oik-blocks/blockicon
2. oik-blocks/blockinfo
3. oik-blocks/blocklist

oik-blocks/blockicon

• The Blocks select list needs to be updated to include the Block variations.
• The display of the icon may need updating

oik-blocks/blockinfo

• The Blocks select list needs to be updated to include the Block variations
• The display should list the variations ( in ascending name or title )
• If the Show block link toggle is on each variation should link to the defined block
• For each variation the values for the other toggles should be respected.

oik-blocks/blocklist

• The list should include variations for each parent block with the selected prefix
• It should no longer be necessary to create oikwp oik-create-blocks.php commands
• The Show block description toggle can be removed

Also, the core BlockIcon should be displayed by passing icon={block.icon}. Was icon={block.icon.src}.

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You can use getBlockVariations( state, blockName, scope ) to get the block variations by block name.

That's the theory. In practice I didn't know how to do this because I was trying to use the wrong API.

In https://developer.wordpress.org/block-editor/packages/packages-blocks/
getBlockVariations is documented as taking two parameters.

1. blockName string: Name of block (example: “core/columns”).
2. scope [WPBlockVariationScope]: Block variation scope name.

where scope is 'block' or 'inserter'.

In https://developer.wordpress.org/block-editor/data/data-core-blocks/ there's a different function with the same name.
This is used when working with select( 'core/blocks').
This is the stuff that I'm still struggling to understand.
Fortunately, I don't need to use this function; I just needed to use the right values for the parameters to the first.

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The Show block description toggle can be removed

Do two things at the same time.

• Change the showDescription toggle to showVariations; to optionally display the Variations.
• Add logic to filter variations when the toggle is off.
• Don't worry about deprecation.