Lib: Make WP_Block->available_context public.

[epiqueras]

See #22199 (comment).

[github-actions]

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Total Size: 833 kB

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_{compressed-size-action}

[epiqueras]

Closing in favor of #22364.

[albanyacademy]

Can we reopen this? @epiqueras

My use case is a little extreme, but it essentially boils down to:

1. I'm using a custom block implementation that only uses serverside render callbacks;
2. I don't want inner_blocks to be automatically parsed all the time as in class-wp-block.php:228 and 159
3. instead, i want to parse them myself and pass contexts like a "rendered inner block index".
4. This means I can't rely on the WP_Block_List generated in class-wp-block.php:159, as the $child_context is the same for all inner_blocks.
5. I need to essentially do my own version, and my serverside template's inner block rendering looks like this:

	public function renderInnerBlocks($contexts = [], $isDynamic = true)
	{
		$index = 0;
		if ($this->innerBlocks) {
			foreach ($this->innerBlocks as $innerBlock) {
                                 // this is a custom array entry in the $parsed_block
				$innerBlock['customContexts'] = array_merge(
					$this->context,  // merged wp_block->context and wp_block->available_context (the latter is always empty)
					$this->providesContext, // custom block method to generate its own provided contexts
					['custom/innerBlockIndex' => $index], // iterative context useful for tabs and accordions (which one is first etc)
					$contexts, // custom ones passed in per block type
				);
 				$innerBlock = new WP_Block($innerBlock);
				echo $innerBlock->render(['dynamic' => $isDynamic]);
				$index++;
			}
		}
	}

So as you can see, I do have a workaround in place, but it does feel like a missed opportunity. Even if it wasn't public, there are no real opportunities/hooks to do fun things with block context if you're going the dynamic/skip_inner_blocks route. This pretty much only happens in scenarios where you wouldn't rely on the WP_Block_List generated as part of wp_block's construct.