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Order ids in getClientIdsOfDescendants and getClientIdsWithDescendants selectors #39985

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merged 1 commit into from
Apr 4, 2022

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@ZebulanStanphill ZebulanStanphill commented Apr 1, 2022

What?

This PR changes the getClientIdsOfDescendants and getClientIdsWithDescendants selectors so that the client ids they return are always ordered according to the order that the blocks actually appear in the post.

Why?

See #29739 (comment). This would greatly simplify the Table of Contents block implementation.

How?

Testing Instructions

🤷‍♂ I guess see if the tests pass?

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Size Change: -6 B (0%)

Total Size: 1.22 MB

Filename Size Change
build/block-editor/index.min.js 148 kB -6 B (0%)
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compressed-size-action

@ZebulanStanphill ZebulanStanphill force-pushed the update/order-client-ids-in-selectors branch from 85330cd to 7f0dedc Compare April 1, 2022 19:13
@ZebulanStanphill ZebulanStanphill added the Needs Technical Feedback Needs testing from a developer perspective. label Apr 1, 2022
@ZebulanStanphill ZebulanStanphill marked this pull request as ready for review April 1, 2022 21:35
@mcsf
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mcsf commented Apr 4, 2022

A quick audit of current usage of this selector in Gutenberg to understand if any consumer may be affected by a change in ordering:

  • getClientIdsOfDescendants( ... ).length and equivalent uses occur a lot in in Navigation-related blocks. Not affected. These should be replaced with simpler selectors anyway, like getBlockOrder or its derivative getBlockCount.
  • getClientIdsOfDescendants( ... )[ 0 ] also occurs a few times. Order matters, but only in so far as the first returned element is concerned. Presumably... not affected. These could probably benefit from less expensive selectors.
  • getClientIdsOfDescendants( ... ).some( ... ). By definition, Array#some doesn't care about order. Not affected.

I haven't spotted any other kind of usage in Gutenberg. Of course, the change could still cause breakage for third parties who have come to rely on the current unspecified behaviour.

I'd still like @youknowriad's wise eyes on this. Otherwise, LGTM.

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LGTM 👍

@ZebulanStanphill ZebulanStanphill removed the Needs Technical Feedback Needs testing from a developer perspective. label Apr 4, 2022
@ZebulanStanphill ZebulanStanphill merged commit a1ae01c into trunk Apr 4, 2022
@ZebulanStanphill ZebulanStanphill deleted the update/order-client-ids-in-selectors branch April 4, 2022 17:00
@github-actions github-actions bot added this to the Gutenberg 13.0 milestone Apr 4, 2022
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mcsf commented Apr 5, 2022

  • getClientIdsOfDescendants( ... ).length and equivalent uses occur a lot in in Navigation-related blocks. Not affected. These should be replaced with simpler selectors anyway, like getBlockOrder or its derivative getBlockCount.
  • getClientIdsOfDescendants( ... )[ 0 ] also occurs a few times. Order matters, but only in so far as the first returned element is concerned. Presumably... not affected. These could probably benefit from less expensive selectors.

cc @getdave in case this is helpful/actionable feedback for the Nav blocks

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getdave commented Apr 5, 2022

Looking into this quickly, I assume we could, for example, replace

selectedBlockHasDescendants: !! getClientIdsOfDescendants( [
selectedBlockId,
] )?.length,

with

selectedBlockHasDescendants: !! getBlockCount( [
    selectedBlockId,
] )?.length,

...using the rootClientId arg of getBlockCount to get the same result?

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There's a recent increase in "block selection" (focus) performance metric. See https://codehealth.vercel.app
I suspect it's this PR but that's a guess, the increase seem to have happened one commit after this one but for me this commit is more suspicious.

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@youknowriad I've created to #40054 to hopefully counteract any slowdown, though I'm not sure how to reliably test the performance to know if the change actually works.

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