[wp-trac] [WordPress Trac] #62069: Block Bindings: block doesn't receive full __default bindings during render

[WordPress Trac]

#62069: Block Bindings: block doesn't receive full __default bindings during render
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 Reporter:  talldanwp     |      Owner:  talldanwp
     Type:  defect (bug)  |     Status:  assigned
 Priority:  normal        |  Milestone:  6.7
Component:  Editor        |    Version:  6.6
 Severity:  normal        |   Keywords:  has-patch needs-unit-tests
  Focuses:                |
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 Original gutenberg issue -
 https://github.com/WordPress/gutenberg/issues/64688

 TLDR - some image block features don't work correctly when the image is
 using a pattern override due to some missing block bindings code in core.

 ----
 Longer explanation:

 The pattern overrides feature is built upon block bindings, and uses a
 special `__default` binding that means all block attributes that support
 binding are bound:
 {{{#!js

 bindings: {
     __default: 'core/pattern-overrides'
 }
 }}}

 During processing of the bindings, this single `__default` binding is
 replaced with the individual binding attributes - e.g.:
 {{{#!js

 bindings: {
     src: 'core/pattern-overrides',
     id: 'core/pattern-overrides',
     caption: 'core/pattern-overrides',
 }
 }}}

 In the gutenberg plugin these individual bindings are assigned back to the
 block before rendering so that the block can reason about which individual
 attributes are bound:
 https://github.com/WordPress/gutenberg/blob/98b8d415830fa9ebf7b4b0a2b95d65b9fd1e813a/lib/compat/wordpress-6.6/blocks.php#L40

 This allows blocks like the image block to check whether an individual
 attribute, like `id` has a binding:
 https://github.com/WordPress/gutenberg/blob/98b8d415830fa9ebf7b4b0a2b95d65b9fd1e813a/packages
 /block-library/src/image/index.php#L31

 Unfortunately core doesn't have the same logic to assign the individual
 bindings back to the block before rendering, which means the image block's
 logic fails. Any block that renders just receives the individual
 `__default` binding.

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/62069>
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