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Fix: Hide new/updated nodes in already hidden tree #21929

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merged 1 commit into from Jul 26, 2021
Merged

Fix: Hide new/updated nodes in already hidden tree #21929

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26 changes: 20 additions & 6 deletions packages/react-reconciler/src/ReactFiberCompleteWork.new.js
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Expand Up @@ -63,6 +63,7 @@ import {NoMode, ConcurrentMode, ProfileMode} from './ReactTypeOfMode';
import {
Ref,
RefStatic,
Placement,
Update,
Visibility,
NoFlags,
Expand Down Expand Up @@ -1369,13 +1370,26 @@ function completeWork(
}
}

// Don't bubble properties for hidden children.
if (
!nextIsHidden ||
includesSomeLane(subtreeRenderLanes, (OffscreenLane: Lane)) ||
(workInProgress.mode & ConcurrentMode) === NoMode
) {
if (!nextIsHidden || (workInProgress.mode & ConcurrentMode) === NoMode) {
bubbleProperties(workInProgress);
} else {
// Don't bubble properties for hidden children unless we're rendering
// at offscreen priority.
if (includesSomeLane(subtreeRenderLanes, (OffscreenLane: Lane))) {
bubbleProperties(workInProgress);
if (supportsMutation) {
// Check if there was an insertion or update in the hidden subtree.
// If so, we need to hide those nodes in the commit phase, so
// schedule a visibility effect.
if (
workInProgress.tag !== LegacyHiddenComponent &&
workInProgress.subtreeFlags & (Placement | Update) &&
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Are we sure it's safe to check/rely on subtreeFlags here?

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It's the static subtree flags that have caused regressions in the past, not the ones that are specific to a particular render, which we still rely on in a bunch of places (e.g. checking subtreeFlags & LayoutMask during the layout phase).

(Though also I believe I fixed the static flag issue in a previous PR, so we should try adding those checks back. Waiting for the Suspense effects feature flag to land first.)

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It's the static subtree flags that have caused regressions in the past, not the ones that are specific to a particular render, which we still rely on in a bunch of places (e.g. checking subtreeFlags & LayoutMask during the layout phase).

Oh, good call.

(Though also I believe I fixed the static flag issue in a previous PR, so we should try adding those checks back. Waiting for the Suspense effects feature flag to land first.)

Oooh, that's exciting.

newProps.mode !== 'unstable-defer-without-hiding'
) {
workInProgress.flags |= Visibility;
}
}
}
}

if (enableCache) {
Expand Down
26 changes: 20 additions & 6 deletions packages/react-reconciler/src/ReactFiberCompleteWork.old.js
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Open in desktop
Expand Up @@ -63,6 +63,7 @@ import {NoMode, ConcurrentMode, ProfileMode} from './ReactTypeOfMode';
import {
Ref,
RefStatic,
Placement,
Update,
Visibility,
NoFlags,
Expand Down Expand Up @@ -1369,13 +1370,26 @@ function completeWork(
}
}

// Don't bubble properties for hidden children.
if (
!nextIsHidden ||
includesSomeLane(subtreeRenderLanes, (OffscreenLane: Lane)) ||
(workInProgress.mode & ConcurrentMode) === NoMode
) {
if (!nextIsHidden || (workInProgress.mode & ConcurrentMode) === NoMode) {
bubbleProperties(workInProgress);
} else {
// Don't bubble properties for hidden children unless we're rendering
// at offscreen priority.
if (includesSomeLane(subtreeRenderLanes, (OffscreenLane: Lane))) {
bubbleProperties(workInProgress);
if (supportsMutation) {
// Check if there was an insertion or update in the hidden subtree.
// If so, we need to hide those nodes in the commit phase, so
// schedule a visibility effect.
if (
workInProgress.tag !== LegacyHiddenComponent &&
workInProgress.subtreeFlags & (Placement | Update) &&
newProps.mode !== 'unstable-defer-without-hiding'
) {
workInProgress.flags |= Visibility;
}
}
}
}

if (enableCache) {
Expand Down
112 changes: 80 additions & 32 deletions packages/react-reconciler/src/__tests__/ReactOffscreen-test.js
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Expand Up @@ -201,14 +201,7 @@ describe('ReactOffscreen', () => {
});
// No layout effect.
expect(Scheduler).toHaveYielded(['Child']);
if (gate(flags => flags.persistent)) {
expect(root).toMatchRenderedOutput(<span hidden={true} prop="Child" />);
} else {
// TODO: Offscreen does not yet hide/unhide children correctly in mutation
// mode. Until we do, it should only be used inside a host component
// wrapper whose visibility is toggled simultaneously.
expect(root).toMatchRenderedOutput(<span prop="Child" />);
}
expect(root).toMatchRenderedOutput(<span hidden={true} prop="Child" />);

// Unhide the tree. The layout effect is mounted.
await act(async () => {
Expand Down Expand Up @@ -255,14 +248,7 @@ describe('ReactOffscreen', () => {
);
});
expect(Scheduler).toHaveYielded(['Unmount layout', 'Child']);
if (gate(flags => flags.persistent)) {
expect(root).toMatchRenderedOutput(<span hidden={true} prop="Child" />);
} else {
// TODO: Offscreen does not yet hide/unhide children correctly in mutation
// mode. Until we do, it should only be used inside a host component
// wrapper whose visibility is toggled simultaneously.
expect(root).toMatchRenderedOutput(<span prop="Child" />);
}
expect(root).toMatchRenderedOutput(<span hidden={true} prop="Child" />);

// Unhide the tree. The layout effect is re-mounted.
await act(async () => {
Expand Down Expand Up @@ -299,14 +285,7 @@ describe('ReactOffscreen', () => {
);
});
expect(Scheduler).toHaveYielded(['Child']);
if (gate(flags => flags.persistent)) {
expect(root).toMatchRenderedOutput(<span hidden={true} prop="Child" />);
} else {
// TODO: Offscreen does not yet hide/unhide children correctly in mutation
// mode. Until we do, it should only be used inside a host component
// wrapper whose visibility is toggled simultaneously.
expect(root).toMatchRenderedOutput(<span prop="Child" />);
}
expect(root).toMatchRenderedOutput(<span hidden={true} prop="Child" />);

// Show the tree. The layout effect is mounted.
await act(async () => {
Expand All @@ -328,14 +307,7 @@ describe('ReactOffscreen', () => {
);
});
expect(Scheduler).toHaveYielded(['Unmount layout', 'Child']);
if (gate(flags => flags.persistent)) {
expect(root).toMatchRenderedOutput(<span hidden={true} prop="Child" />);
} else {
// TODO: Offscreen does not yet hide/unhide children correctly in mutation
// mode. Until we do, it should only be used inside a host component
// wrapper whose visibility is toggled simultaneously.
expect(root).toMatchRenderedOutput(<span prop="Child" />);
}
expect(root).toMatchRenderedOutput(<span hidden={true} prop="Child" />);
});

// @gate experimental || www
Expand Down Expand Up @@ -385,4 +357,80 @@ describe('ReactOffscreen', () => {
});
expect(Scheduler).toHaveYielded(['Unmount layout']);
});

// @gate experimental || www
it('hides new insertions into an already hidden tree', async () => {
const root = ReactNoop.createRoot();
await act(async () => {
root.render(
<Offscreen mode="hidden">
<span>Hi</span>
</Offscreen>,
);
});
expect(root).toMatchRenderedOutput(<span hidden={true}>Hi</span>);

// Insert a new node into the hidden tree
await act(async () => {
root.render(
<Offscreen mode="hidden">
<span>Hi</span>
<span>Something new</span>
</Offscreen>,
);
});
expect(root).toMatchRenderedOutput(
<>
<span hidden={true}>Hi</span>
{/* This new node should also be hidden */}
<span hidden={true}>Something new</span>
</>,
);
});

// @gate experimental || www
it('hides updated nodes inside an already hidden tree', async () => {
const root = ReactNoop.createRoot();
await act(async () => {
root.render(
<Offscreen mode="hidden">
<span>Hi</span>
</Offscreen>,
);
});
expect(root).toMatchRenderedOutput(<span hidden={true}>Hi</span>);

// Set the `hidden` prop to on an already hidden node
await act(async () => {
root.render(
<Offscreen mode="hidden">
<span hidden={false}>Hi</span>
</Offscreen>,
);
});
// It should still be hidden, because the Offscreen container overrides it
expect(root).toMatchRenderedOutput(<span hidden={true}>Hi</span>);

// Unhide the boundary
await act(async () => {
root.render(
<Offscreen mode="visible">
<span hidden={true}>Hi</span>
</Offscreen>,
);
});
// It should still be hidden, because of the prop
expect(root).toMatchRenderedOutput(<span hidden={true}>Hi</span>);

// Remove the `hidden` prop
await act(async () => {
root.render(
<Offscreen mode="visible">
<span>Hi</span>
</Offscreen>,
);
});
// Now it's visible
expect(root).toMatchRenderedOutput(<span>Hi</span>);
});
});