Caches the output of get_item_schema() to avoid redundant recomputation of translatable strings and other computed values. This method is called many times per item in each REST request, and the results of the method should not vary between calls.
Additional schema fields are not cached.
Props kadamwhite, joehoyle, TimothyBlynJacobs.
Fixes#47871.
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- Skips validation where there is no attribute definition, but keeps the attribute value. Previously, the attribute would be omitted from the attributes passed to `render_callback`. Notably, this resolves an issue where `render_callback` cannot receive a block's `align` and `customClassName` attribute values, since these are defined as a client-side filter.
- Validates `null` as a proper value in its own right. Previously, a client implementation of a block could track `{“attribute":null}` as an explicitly empty value, and the server would wrongly initiate defaulting behavior. The new behavior will now only populate a default value if the attribute is not defined at all, including when unset in its being invalid per the attribute schema.
Props aduth, noisysocks, youknowriad, danielbachhuber.
Merges [43918] to trunk.
See #45145 for the patch, #45098 for the original ticket.
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`WP_REST_Block_Renderer_Controller` allows rendering of server-side rendered blocks, whilst `WP_REST_Blocks_Controller` allows retrieving of reusable blocks.
Merges [43805] and [43806] from the 5.0 branch to trunk.
Props desrosj, danielbachhuber, pento, Presskopp, swissspidy.
See #45065, #45098.
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