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Keep onTouchStart, onTouchMove, and onWheel passive #19654

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merged 2 commits into from Aug 19, 2020

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@gaearon gaearon commented Aug 19, 2020

Resolves #19651.

This means that e.preventDefault() in them stays broken, like it was in React 16 due to Chrome's intervention, even though we've switched from putting them on the document to putting them on the root.

This makes React 17 match the React 16 behavior closer, as our goal is to reduce the breaking changes between them.

Note that this also means that any browsers that don't implement the intervention but do implement passive events will now get the post-intervention behavior:

Screenshot 2020-08-19 at 17 33 57

This seems like technically it could be breaking if you target iOS Safari, however MDN may be out of date.

For example, this answer says iOS 11 aligned with Chrome.

So it should be ok.

Test Plan

Should be self-explanatory but I did some manual testing for onWheel. I'll test others before merge. Tested.

@gaearon gaearon requested a review from sebmarkbage Aug 19, 2020
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@gaearon
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@gaearon gaearon commented Aug 19, 2020

Seems like it might be risky in WWW in case we rely on old behavior. I'll put it behind a flag but set it on in open source.

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@gaearon gaearon commented Aug 19, 2020

I put it behind a flag in WWW but left it enabled in open source.

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@trueadm trueadm commented Aug 19, 2020

What about pointer events?

@gaearon
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@gaearon gaearon commented Aug 19, 2020

I don't think they're relevant here? Chrome doesn't print anything if you e.preventDefault() pointerdown or pointermove. And it doesn't seem like pointer events ever respected it for that purpose (they use CSS touch-action instead). All of the existing documentation about the intervention only refers to touch and wheel events. The intervention blog post also implies pointer events don't suffer from this.

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@trueadm trueadm commented Aug 19, 2020

@gaearon Ah okay. Thanks for looking into it! :)

@gaearon gaearon merged commit dd651df into facebook:master Aug 19, 2020
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@trueadm trueadm commented Aug 19, 2020

We should also follow up with a test and check that the below works as expected (it should do, as we check if isPassiveListener is undefined first) and also so we don't accidently regress it in the future:

const setClick = ReactDOM.unstable_createEventHandle('touchstart', {passive: false});

function Component() {
  const ref = useRef(null);

  useEffect(() => {
    return setClick(ref.current, e => e.preventDefault());
  });

  return <button ref={ref}></button>
}
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@koba04 koba04 commented Aug 20, 2020

@trueadm I've created a PR to add a test based on your comment. #19658

facebook-github-bot added a commit to facebook/react-native that referenced this pull request Oct 27, 2020
Summary:
This sync includes the following changes:
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- **[60ba723bf](facebook/react@60ba723 )**: Add SuspenseList to devTools ([#19684](facebook/react#19684)) //<Ben Pernick>//
- **[5564f2c95](facebook/react@5564f2c )**: Add React.startTransition ([#19696](facebook/react#19696)) //<Ricky>//
- **[c4e0768d7](facebook/react@c4e0768 )**: Remove unused argument from `finishConcurrentRender` ([#19689](facebook/react#19689)) //<inottn>//
- **[848bb2426](facebook/react@848bb24 )**: Attach Listeners Eagerly to Roots and Portal Containers ([#19659](facebook/react#19659)) //<Dan Abramov>//
- **[d2e914ab4](facebook/react@d2e914a )**: Remove remaining references to effect list ([#19673](facebook/react#19673)) //<Andrew Clark>//
- **[d6e433899](facebook/react@d6e4338 )**: Use Global Render Timeout for CPU Suspense ([#19643](facebook/react#19643)) //<Sebastian Markbåge>//
- **[64ddef44c](facebook/react@64ddef4 )**: Revert "Remove onScroll bubbling flag ([#19535](facebook/react#19535))" ([#19655](facebook/react#19655)) //<Dan Abramov>//
- **[dd651df05](facebook/react@dd651df )**: Keep onTouchStart, onTouchMove, and onWheel passive ([#19654](facebook/react#19654)) //<Dan Abramov>//
- **[b8fa09e9e](facebook/react@b8fa09e )**: provide profiling bundle for react-reconciler ([#19559](facebook/react#19559)) //<Julien Gilli>//
- **[23595ff59](facebook/react@23595ff )**: Add missing param to safelyCallDestroy() ([#19638](facebook/react#19638)) //<Brian Vaughn>//
- **[ee409ea3b](facebook/react@ee409ea )**: change destroy to safelyCallDestroy ([#19605](facebook/react#19605)) //<Luna Ruan>//
- **[bcca5a6ca](facebook/react@bcca5a6 )**: Always skip unmounted/unmounting error boundaries ([#19627](facebook/react#19627)) //<Brian Vaughn>//
- **[1a41a196b](facebook/react@1a41a19 )**: Append text string to <Text> error message ([#19581](facebook/react#19581)) //<Timothy Yung>//
- **[e4afb2fdd](facebook/react@e4afb2f )**: eslint-plugin-react-hooks@4.1.0 //<Dan Abramov>//
- **[ced05c46c](facebook/react@ced05c4 )**: Update CHANGELOG.md //<Dan Abramov>//
- **[702fad4b1](facebook/react@702fad4 )**: refactor fb.me redirect link to reactjs.org/link ([#19598](facebook/react#19598)) //<CY Lim>//
- **[49cd77d24](facebook/react@49cd77d )**: fix: leak strict mode with UMD builds ([#19614](facebook/react#19614)) //<Toru Kobayashi>//
- **[ffb749c95](facebook/react@ffb749c )**: Improve error boundary handling for unmounted subtrees ([#19542](facebook/react#19542)) //<Brian Vaughn>//
- **[9b35dd2fc](facebook/react@9b35dd2 )**: Permanently removed component stacks from scheduling profiler data ([#19615](facebook/react#19615)) //<Brian Vaughn>//
- **[3f8115cdd](facebook/react@3f8115c )**: Remove `didTimeout` check from work loop //<Andrew Clark>//
- **[9abc2785c](facebook/react@9abc278 )**: Remove wasteful checks from `shouldYield` //<Andrew Clark>//
- **[1d5e10f70](facebook/react@1d5e10f )**: [eslint-plugin-react-hooks] Report constant constructions ([#19590](facebook/react#19590)) //<Jordan Eldredge>//
- **[dab0854c5](facebook/react@dab0854 )**: Move commit passive unmount/mount to CommitWork ([#19599](facebook/react#19599)) //<Sebastian Markbåge>//
- **[ccb6c3945](facebook/react@ccb6c39 )**: Remove unused argument ([#19600](facebook/react#19600)) //<inottn>//
- **[629125555](facebook/react@6291255 )**: [Scheduler] Re-throw unhandled errors ([#19595](facebook/react#19595)) //<Andrew Clark>//
- **[b8ed6a1aa](facebook/react@b8ed6a1 )**: [Scheduler] Call postTask directly ([#19551](facebook/react#19551)) //<Andrew Clark>//
- **[ce37bfad5](facebook/react@ce37bfa )**: Remove resolutions from test renderer package.json ([#19577](facebook/react#19577)) //<Dan Abramov>//
- **[2704bb537](facebook/react@2704bb5 )**: Add ReactVersion to SchedulingProfiler render scheduled marks ([#19553](facebook/react#19553)) //<Kartik Choudhary>//
- **[0c52e24cb](facebook/react@0c52e24 )**: Support inner component _debugOwner in memo ([#19556](facebook/react#19556)) //<Brian Vaughn>//
- **[0cd9a6de5](facebook/react@0cd9a6d )**: Parallelize Jest in CI ([#19552](facebook/react#19552)) //<Andrew Clark>//
- **[a63893ff3](facebook/react@a63893f )**: Warn about undefined return value for memo and forwardRef ([#19550](facebook/react#19550)) //<Brian Vaughn>//
- **[32ff42868](facebook/react@32ff428 )**: Add feature flag for setting update lane priority ([#19401](facebook/react#19401)) //<Ricky>//
- **[5bdd4c8c6](facebook/react@5bdd4c8 )**: Remove unused argument from call to jest method ([#19546](facebook/react#19546)) //<Gustavo Saiani>//
- **[a5fed98a9](facebook/react@a5fed98 )**: Register more node types that are used later as JSXIdentifiers ([#19514](facebook/react#19514)) //<Mateusz Burzyński>//
- **[f77c7b9d7](facebook/react@f77c7b9 )**: Re-add discrete flushing timeStamp heuristic (behind flag) ([#19540](facebook/react#19540)) //<Dominic Gannaway>//

Changelog: [general] [feature] Upgrade to React 17

Reviewed By: cpojer

Differential Revision: D24491201

fbshipit-source-id: c947da9dcccbd614e9dc58f3339b63e24829aca7
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