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useBlockControlsFill: avoid unneeded store subscriptions #55340

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merged 1 commit into from
Oct 13, 2023

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@jsnajdr jsnajdr commented Oct 13, 2023

When a block renders a <BlockControls> markup, its contents are rendered in the slot only if the block is selected. The useBlockControlsFill ensures that, returning a non-null fill only when the block is selected.

This PR optimizes the useBlockControlsFill hook: if shareWithChildBlocks is false, it can return early without creating any subscriptions to the block-editor store. And reducing number of subscriptions helps fix #54819.

On a large post with 1000 blocks, I'm seeing (using the debug code from #55337) a reduction by 1500 subscriptions, from 77.5k to 76k.

@jsnajdr jsnajdr added [Type] Performance Related to performance efforts [Package] Block editor /packages/block-editor labels Oct 13, 2023
@jsnajdr jsnajdr self-assigned this Oct 13, 2023
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Size Change: 0 B

Total Size: 1.65 MB

ℹ️ View Unchanged
Filename Size
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Nice find 👍

It's a pretty straightforward change and I'm fairly confident it's safe.

While it doesn't bring amazing perf improvements, it's still a nice little one.

Thanks 🚀

@jsnajdr jsnajdr merged commit e21581b into trunk Oct 13, 2023
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@jsnajdr jsnajdr deleted the optimize/block-controls-select branch October 13, 2023 11:10
@github-actions github-actions bot added this to the Gutenberg 16.9 milestone Oct 13, 2023
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Something that came up while discussing these kinds of optimizations is that it could be worth adding a comment to describe what we're doing. Otherwise, it could be very easy to lose this optimization in a refactor.

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