Use block specific filters for the backward compatibility markup hooks #39321
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What?
This is a code quality improvement to this PR #38657
The linked PR removed some useless "div" containers from image blocks that use left/right/center alignment. It did so only for themes that support the layout feature but to retain backward compatibility the divs are added back in the frontend using the render_block callback.
But since, WP 5.7 there are specific block filters we can use instead of the generic one.
Why?
This is a code quality and a tiny perf improvement.
Testing Instructions