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Post content block: apply the_content filter before checking if content is empty #31997

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merged 2 commits into from
May 20, 2021

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Aljullu
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@Aljullu Aljullu commented May 19, 2021

Closes #31995.

Description

This PR reorders the render logic of the Post content block so the_content filter is applied before the early return for empty content.

How has this been tested?

  1. The testing steps include a minimal setup to reproduce the issue and verify the fix.
  2. WooCommerce relies on the_content filter to append the Shop page contents. I tested that when the page has no text, Shop contents are displayed.

Step-by-step reproduction instructions

  1. Add a filter like this:
function filter_function_name( $excerpt ) {
	return "Filtered -- $excerpt";
}
add_filter( 'the_content', 'filter_function_name' );
  1. Create a page without any text.
  2. Using a block-based theme, verify the page content has the Filtered -- prefix.

@Aljullu Aljullu added the [Block] Post Content Affects the Post Content Block label May 19, 2021
@Aljullu Aljullu self-assigned this May 19, 2021
@Aljullu Aljullu requested a review from ajitbohra as a code owner May 19, 2021 13:40
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Aljullu commented May 19, 2021

@mcsf I see you were the last one to make changes in this file, do you mind taking a look at this PR or marking somebody else for review? Thanks!

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@Aljullu: the fix itself looks good, feel free to merge.

I see you were the last one to make changes in this file, do you mind taking a look at this PR or marking somebody else for review?

For what it's worth, this issue stems from the branching introduced in #30961, which sought to avoid printing empty containers in the front end by returning early from render_block_core_post_content. @carolinan, @aristath: just flagging this for you, as it highlights some pitfalls of #30571 (reductions aren't necessarily simplifications).

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Size Change: 0 B

Total Size: 1.62 MB

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@Aljullu Aljullu force-pushed the fix/apply-the_content-filter-before-empty-check branch from f609d6d to adf28af Compare May 20, 2021 08:09
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Aljullu commented May 20, 2021

I'm having some trouble getting e2e tests to pass in this PR, but failures don't seem to be related to the changes introduced here. @mcsf @aristath is that something you can help me with? I'm unable to merge if all required jobs don't pass.

@Aljullu Aljullu force-pushed the fix/apply-the_content-filter-before-empty-check branch from adf28af to 12819ca Compare May 20, 2021 10:52
@Aljullu Aljullu merged commit f3a5763 into trunk May 20, 2021
@Aljullu Aljullu deleted the fix/apply-the_content-filter-before-empty-check branch May 20, 2021 11:32
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Aljullu commented May 20, 2021

All green after rebase. I could merge it. 🙂

@github-actions github-actions bot added this to the Gutenberg 10.7 milestone May 20, 2021
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Post content block: 'the_content' filter is ignored if post content is empty
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