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Popover: enable auto-updating every animation frame #43617

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merged 4 commits into from
Aug 29, 2022

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@ciampo ciampo commented Aug 25, 2022

Dev note

See the dev note in #44195

What?

Fixes #42725

This PR changes the way floating-ui auto-updates the popover's position by enabling the animationFrame option. This means that the popover position is recalculated every animation frame (see the docs for more details).

This has a few benefits:

  • The "second gen" popovers are updated correctly without needing to add additional event listeners (see Site editor: Block settings dropdown remains in place when scrolling #42725)
  • The __unstableObserveElement prop (and the associated MutationObserver) are not necessary anymore, and can be removed
  • The scroll event listener added to the iframe is not necessary anymore, and can be removed
  • Popovers tracking anchors across different frames (i.e the block toolbar in the site editor) are less laggy, since they are updated every animation frame

Why?

Currently, the Popover element adds some custom event listeners to the anchor and its onwerDocument when the anchor is in a different document from the popover (i.e. in an iframe, which is the case for the block toolbar in the site editor).

These events don't cover all edge cases, and are therefore prone to causing regressions when other parts of the Popover are updated.

How?

By setting the animationFrame option to true when calling the autoUpdate function from floating-ui

What is not included in this PR

The changes in this PR were inspired by the work done in #43335, but I've deliberately decided to keep this PR as small as possible to make it easier to review.

I plan on iterate on Popover improvements in #43335, where I'm exploring / going to explore the following ideas:

  • calling autoUpdate only as part of the useFloating function call (and not in the useLayoutEffect hook, like it is at the moment)
  • leverage more internal state and references, in order to have the Popover component update correctly and more frequently in more scenarios (e.g. prop change, ref changes...)
  • update the reference within the same useLayoutEffect where the reference itself is computed
  • use ResizeObserver instead of listening to the resize event
  • see if it's possible to simplify computing the ownerDocument

Testing Instructions

  • In the site editor, select a block. From the the block toolbar, open any submenu (like the the settings menu) that causes a second popover to open
  • scroll the document, and make sure that both popovers update their position correctly

Check that the remaining popovers behave as expected, without any regressions..

Screenshots or screencast

Kapture.2022-08-25.at.16.18.14.mp4

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Size Change: -67 B (0%)

Total Size: 1.24 MB

Filename Size Change
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ℹ️ View Unchanged
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@ciampo ciampo self-assigned this Aug 25, 2022
@ciampo ciampo added [Feature] UI Components Impacts or related to the UI component system [Type] Regression Related to a regression in the latest release [Package] Components /packages/components labels Aug 25, 2022
@ciampo ciampo marked this pull request as ready for review August 25, 2022 15:22
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LGTM! Thanks for exploring an alternative fix.

A note about performance, in testing the toolbar/popover position is laggier when scrolling if a toolbar dropdown (like the block settings menu) is open, but I don't notice any difference if toolbar dropdowns are closed.

I think it's more important to fix the bug right now, and then look at performance separately, so it'd be good to move ahead with merging this.

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ciampo commented Aug 29, 2022

Just rebased this PR, will merge once CI is ✅

Regarding performance, I didn't really spot increased lagginess, but I really didn't do much testing on that, as I focused on fixing the bugs.

Once this PR gets merged, I should be able to work on #43335, which hopefully may bring some perf improvements 🤞 although the "real" fix will be to improve cross-document support directly in floating-ui (floating-ui/floating-ui#1869)

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ciampo commented Aug 31, 2022

This PR seems to have broken the draggable block e2e tests, I'll see if I can make the test work — otherwise I will open a PR that will partially undo the changes from this PR

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ciampo commented Aug 31, 2022

#43734

@ciampo ciampo added the Needs Dev Note Requires a developer note for a major WordPress release cycle label Sep 15, 2022
update
update,
{
animationFrame: true,
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I noticed that you did some follow-up work to this, so I was wondering if this is still necessary. The reason I'm asking is because this line is a source of a large impact on performance degradation potentially.

It now happens in the "select" and "inserter open" metrics after this PR #42722 but it can also happen I guess for other interactions when there's a big list of popovers.

So can we remove it or is it still necessary? Are there alternatives?

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I guess this can be opt-in (or opt-out). However, I think it's generally a bad practice to render a large list of popovers at the same time. The performance regression in #42722 is a bit extreme that we render 1000 empty paragraphs in the test, but I do think we can refactor it in a follow-up to improve this.

From the floating-ui doc:

This is optimized for performance but can still be costly.

This option should be used sparingly...

I guess it makes sense to make it an opt-in in the next major release?

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This was introduced mainly to fix #42725, I expect that bug (and any other nested popover) to happen again if we undo this change — maybe it could be just enabled for the block toolbar?

While I agree that calling the getBoundingClientRect function every animation frame is not ideal, I would also argue that the main reason while this can be a noticeable regression is that we're rendering hundreds of popovers at the same time.

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It turned out that the main issue for the performance regression is not this, so I'm ok not doing anything here and keeping it as but we should keep an eye on this any way as mentioned on their docs.

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Sure, makes sense

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[Feature] UI Components Impacts or related to the UI component system Needs Dev Note Requires a developer note for a major WordPress release cycle [Package] Components /packages/components [Type] Regression Related to a regression in the latest release
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Site editor: Block settings dropdown remains in place when scrolling
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