Prevent LayoutBuilder from rebuilding more than once #147856

LongCatIsLooong · 2024-05-06T10:11:54Z

Fixes #146379: introduces Element.buildScope which BuildOwner.buildScope uses to identify subtrees that need skipping (those with different BuildScopes). If Element.update calls updateChild then dirty children will still be rebuilt regardless of their build scopes.

This also introduces LayoutBuilder.applyDoubleRebuildFix migration flag which should only live for a week or less.

Caveats:

LayoutBuilder's render object calls markNeedsLayout if a descendant Element is dirty. Since markNeedsLayout also implies markNeedsPaint, the render object is going to be very repaint/relayout-happy.

Tests:

Presubmits with the migration flag set to true: https://github.com/flutter/flutter/pull/147856/checks?check_run_id=24629865893

Pre-launch Checklist

I read the Contributor Guide and followed the process outlined there for submitting PRs.
I read the Tree Hygiene wiki page, which explains my responsibilities.
I read and followed the Flutter Style Guide, including Features we expect every widget to implement.
I signed the CLA.
I listed at least one issue that this PR fixes in the description above.
I updated/added relevant documentation (doc comments with ///).
I added new tests to check the change I am making, or this PR is test-exempt.
I followed the breaking change policy and added Data Driven Fixes where supported.
All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel on Discord.

…d-once

LongCatIsLooong · 2024-05-10T03:31:45Z

packages/flutter/lib/src/widgets/framework.dart

The change moves dirty element tracking / rebuilding logic from BuildOwner to BuildScope, and keeps GlobalKey management stuff in BuildOwner

packages/flutter/lib/src/widgets/framework.dart

goderbauer · 2024-05-22T19:28:42Z

packages/flutter/lib/src/widgets/framework.dart

+    try {
+      for (int index = 0; index < _dirtyElements.length; index = _dirtyElementIndexAfter(index)) {
+        final Element element = _dirtyElements[index];
+        if (identical(element.buildScope, this)) {


For my own understanding: Why do we need to check that they are still assigned this build scope? Can an element switch to a different build scope between getting marked as dirty and flushing dirty elements? (I guess this could happen maybe with global key moves?)

Yeah global key reparenting is the sole reason (it's documented that currently an Element must not change its buildScope at runtime): a dirty Element can be re-activated in a subtree that has a different build scope, in which case the dirty Element will show up in the dirty lists of both its old buildscope and the new buildscope.

packages/flutter/lib/src/widgets/framework.dart

goderbauer · 2024-05-22T19:53:19Z

packages/flutter/lib/src/widgets/framework.dart

      // (the root node), the owner should have already been assigned.
      // See RootRenderObjectElement.assignOwner().
      _owner = parent.owner;
+      _buildScope = parent.buildScope;


Sooo if I override buildScope to return something custom (e.g. as done in the LayoutBuilder) buildScope and _buildScope would return different things?

Yeah. _buildScope is the parent.buildScope cache, and should not be read by anyone except buildScope.

Makes sense, as suggested in another comment, maybe we should rename _buildScope to avoid that it is being confused as the backing store for the buildScope getter, which it only sometimes is.

goderbauer · 2024-05-22T19:56:21Z

packages/flutter/lib/src/widgets/layout_builder.dart

+  /// [SliverLayoutBuilder]s should apply the double rebuild fix. This flag is
+  /// for migration only and **SHOULD NOT BE USED**.
+  @Deprecated('This is a temporary migration flag. DO NOT USE THIS.') // flutter_ignore: deprecation_syntax (see analyze.dart)
+  static bool applyDoubleRebuildFix = false;


What is this breaking that requires this migration flag?

https://logs.chromium.org/logs/flutter/buildbucket/cr-buildbucket/8748687281455715169/+/u/run_test.dart_for_customer_testing_shard_and_subshard_None/stdout

and some scuba tests that I unfortunately didn't save the links to.

packages/flutter/lib/src/widgets/framework.dart

packages/flutter/test/widgets/framework_test.dart

goderbauer

LGTM

packages/flutter/lib/src/widgets/framework.dart

Co-authored-by: Michael Goderbauer <[email protected]>

* master: (115 commits) Roll Flutter Engine from 4adf453b6d68 to 19707e811b60 (1 revision) (flutter#149291) disable Impeller on external texture test. (flutter#149292) Roll Flutter Engine from 8d5d14a1db95 to 4adf453b6d68 (12 revisions) (flutter#149290) Update 3.22.1 release notes to include missing fix. (flutter#148999) Manual roll Flutter Engine from 60968ee3bde7 to 8d5d14a1db95 (1 revision) (flutter#149263) Reverts "Prevent LayoutBuilder from rebuilding more than once (flutter#147856)" (flutter#149279) Unskip expression evaluation test (flutter#149253) temporarily disable SemanticsAction tests to unblock engine change (flutter#149274) Adds benchmark for rrect_blur. (flutter#149261) Prevent LayoutBuilder from rebuilding more than once (flutter#147856) Add test for inherited_theme.0.dart (flutter#149120) Update progress_indicator.dart to indicate the adaptive option is for both macOS and iOS (flutter#145246) _ModalScopeStatus as InheritedModel (flutter#149022) Add test for radio.toggleable.0.dart (flutter#149153) Add a sentinel value for `TextStyle.height` (flutter#149049) Remove dynamic_layouts from issue template (flutter#149252) Roll Flutter Engine from 30aa720d4999 to 60968ee3bde7 (1 revision) (flutter#149255) Roll Flutter Engine from b26e1b023cdb to 30aa720d4999 (7 revisions) (flutter#149249) Roll Packages from a933c30 to 31d3329 (6 revisions) (flutter#149246) Clean leak in editable_text_test.dart. (flutter#149223) ...

…/flutter#147856)

Fixes flutter#146379: introduces `Element.buildScope` which `BuildOwner.buildScope` uses to identify subtrees that need skipping (those with different `BuildScope`s). If `Element.update` calls `updateChild` then dirty children will still be rebuilt regardless of their build scopes. This also introduces `LayoutBuilder.applyDoubleRebuildFix` migration flag which should only live for a week or less. Caveats: `LayoutBuilder`'s render object calls `markNeedsLayout` if a descendant Element is dirty. Since `markNeedsLayout` also implies `markNeedsPaint`, the render object is going to be very repaint/relayout-happy. Tests: Presubmits with the migration flag set to true: https://github.com/flutter/flutter/pull/147856/checks?check_run_id=24629865893

…r#147856)" (flutter#149279) Reverts: flutter#147856 Initiated by: loic-sharma Reason for reverting: tree is closed with errors like: ``` test/integration.shard/break_on_framework_exceptions_test.dart: breaks when rebuilding dirty elements throws [E] Expected: <45> Actual: <2756> package:matcher expect test\integration.shard\break_on_framework_exceptions_test.dart 56:5 main.expectException ===== asynchronous gap === Original PR Author: LongCatIsLooong Reviewed By: {goderbauer} This change reverts the following previous change: Fixes flutter#146379: introduces `Element.buildScope` which `BuildOwner.buildScope` uses to identify subtrees that need skipping (those with different `BuildScope`s). If `Element.update` calls `updateChild` then dirty children will still be rebuilt regardless of their build scopes. This also introduces `LayoutBuilder.applyDoubleRebuildFix` migration flag which should only live for a week or less. Caveats: `LayoutBuilder`'s render object calls `markNeedsLayout` if a descendant Element is dirty. Since `markNeedsLayout` also implies `markNeedsPaint`, the render object is going to be very repaint/relayout-happy. Tests: Presubmits with the migration flag set to true: https://github.com/flutter/flutter/pull/147856/checks?check_run_id=24629865893

flutter/flutter@c85fa6a...7eebe29 2024-05-30 [email protected] Roll Packages from 31d3329 to 910fabb (11 revisions) (flutter/flutter#149321) 2024-05-30 [email protected] Roll Flutter Engine from fb64b9a4e6f2 to 2fedfd3cc6e5 (2 revisions) (flutter/flutter#149320) 2024-05-30 [email protected] Fix `Slider` throws an error when `_labelPainter` text is null (flutter/flutter#148462) 2024-05-30 [email protected] Roll Flutter Engine from 5500c1a3969a to fb64b9a4e6f2 (1 revision) (flutter/flutter#149307) 2024-05-30 [email protected] Enable `explicitChildNodes` for the `AlertDialog` content (flutter/flutter#149130) 2024-05-30 [email protected] Roll Flutter Engine from 0c95e85dfbf4 to 5500c1a3969a (1 revision) (flutter/flutter#149304) 2024-05-30 [email protected] Roll Flutter Engine from 19707e811b60 to 0c95e85dfbf4 (1 revision) (flutter/flutter#149300) 2024-05-30 [email protected] Roll Flutter Engine from 4adf453b6d68 to 19707e811b60 (1 revision) (flutter/flutter#149291) 2024-05-30 [email protected] disable Impeller on external texture test. (flutter/flutter#149292) 2024-05-30 [email protected] Roll Flutter Engine from 8d5d14a1db95 to 4adf453b6d68 (12 revisions) (flutter/flutter#149290) 2024-05-30 [email protected] Update 3.22.1 release notes to include missing fix. (flutter/flutter#148999) 2024-05-30 [email protected] Manual roll Flutter Engine from 60968ee3bde7 to 8d5d14a1db95 (1 revision) (flutter/flutter#149263) 2024-05-29 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Prevent LayoutBuilder from rebuilding more than once (#147856)" (flutter/flutter#149279) 2024-05-29 [email protected] Unskip expression evaluation test (flutter/flutter#149253) 2024-05-29 [email protected] temporarily disable SemanticsAction tests to unblock engine change (flutter/flutter#149274) 2024-05-29 [email protected] Adds benchmark for rrect_blur. (flutter/flutter#149261) 2024-05-29 [email protected] Prevent LayoutBuilder from rebuilding more than once (flutter/flutter#147856) 2024-05-29 [email protected] Add test for inherited_theme.0.dart (flutter/flutter#149120) 2024-05-29 [email protected] Update progress_indicator.dart to indicate the adaptive option is for both macOS and iOS (flutter/flutter#145246) 2024-05-29 [email protected] _ModalScopeStatus as InheritedModel (flutter/flutter#149022) 2024-05-29 [email protected] Add test for radio.toggleable.0.dart (flutter/flutter#149153) 2024-05-29 [email protected] Add a sentinel value for `TextStyle.height` (flutter/flutter#149049) 2024-05-29 [email protected] Remove dynamic_layouts from issue template (flutter/flutter#149252) 2024-05-29 [email protected] Roll Flutter Engine from 30aa720d4999 to 60968ee3bde7 (1 revision) (flutter/flutter#149255) 2024-05-29 [email protected] Roll Flutter Engine from b26e1b023cdb to 30aa720d4999 (7 revisions) (flutter/flutter#149249) 2024-05-29 [email protected] Roll Packages from a933c30 to 31d3329 (6 revisions) (flutter/flutter#149246) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-packages Please CC [email protected],[email protected],[email protected] on the revert to ensure that a human is aware of the problem. To file a bug in Packages: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://issues.skia.org/issues/new?component=1389291&template=1850622 Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

…" (#149303) Diff commit: a3f7aca In the failing tests the debugger treated the exception thrown by `Element.rebuild` as a caught exception in the absence of the vm pragma.

LayoutBuilder migration: LayoutBuilders no longer do double layout (currently the fix is behind a temporary flag). Related flutter/flutter PR: flutter/flutter#147856

…/flutter#147856)

For flutter/flutter#147856, commit PR: fzyzcjy/flutter_portal#113

…pdate * master: (168 commits) Fix the scrolling layout deviation of `CupertinoActionSheet` (flutter#149439) Roll Flutter Engine from 60a7bb2353b6 to a6aa5d826649 (2 revisions) (flutter#149627) Roll Flutter Engine from ea72558be758 to 60a7bb2353b6 (2 revisions) (flutter#149623) Place `flutter_gpu` in the package cache. (flutter#149299) Switch to triage-* labels for platform package triage (flutter#149614) Roll pub packages (flutter#149617) Fixes multi line textfield hint text gets ellipsized (flutter#148423) Support failures-only and silent reporters in `flutter test` (flutter#148739) [CupertinoActionSheet] Fix overflow of the overscroll section when the user scrolls far (flutter#149542) Fix InputDecorator.prefixIcon color when disabled (flutter#149595) Added filter callback on dropdown menu (flutter#143939) update generated localized message files in the stocks test app (flutter#148741) Add a simplified SimpleCascadingMenuApp example (flutter#149147) Reland "Prevent LayoutBuilder from rebuilding more than once (flutter#147856)" (flutter#149303) Move some benchmarks from MotoG4 to Mokey (flutter#149567) Roll Packages from d8e8e8c to 11e192a (2 revisions) (flutter#149596) Cleanup triage reports from docs/ (flutter#149545) Roll Flutter Engine from d81edf635a9f to ea72558be758 (1 revision) (flutter#149590) Roll Flutter Engine from b0f4d7459708 to d81edf635a9f (1 revision) (flutter#149468) Roll Flutter Engine from 40b868efcc46 to b0f4d7459708 (1 revision) (flutter#149467) ...

…pdate * master: (181 commits) Fix the scrolling layout deviation of `CupertinoActionSheet` (flutter#149439) Roll Flutter Engine from 60a7bb2353b6 to a6aa5d826649 (2 revisions) (flutter#149627) Roll Flutter Engine from ea72558be758 to 60a7bb2353b6 (2 revisions) (flutter#149623) Place `flutter_gpu` in the package cache. (flutter#149299) Switch to triage-* labels for platform package triage (flutter#149614) Roll pub packages (flutter#149617) Fixes multi line textfield hint text gets ellipsized (flutter#148423) Support failures-only and silent reporters in `flutter test` (flutter#148739) [CupertinoActionSheet] Fix overflow of the overscroll section when the user scrolls far (flutter#149542) Fix InputDecorator.prefixIcon color when disabled (flutter#149595) Added filter callback on dropdown menu (flutter#143939) update generated localized message files in the stocks test app (flutter#148741) Add a simplified SimpleCascadingMenuApp example (flutter#149147) Reland "Prevent LayoutBuilder from rebuilding more than once (flutter#147856)" (flutter#149303) Move some benchmarks from MotoG4 to Mokey (flutter#149567) Roll Packages from d8e8e8c to 11e192a (2 revisions) (flutter#149596) Cleanup triage reports from docs/ (flutter#149545) Roll Flutter Engine from d81edf635a9f to ea72558be758 (1 revision) (flutter#149590) Roll Flutter Engine from b0f4d7459708 to d81edf635a9f (1 revision) (flutter#149468) Roll Flutter Engine from 40b868efcc46 to b0f4d7459708 (1 revision) (flutter#149467) ...

* master: (181 commits) Fix the scrolling layout deviation of `CupertinoActionSheet` (flutter#149439) Roll Flutter Engine from 60a7bb2353b6 to a6aa5d826649 (2 revisions) (flutter#149627) Roll Flutter Engine from ea72558be758 to 60a7bb2353b6 (2 revisions) (flutter#149623) Place `flutter_gpu` in the package cache. (flutter#149299) Switch to triage-* labels for platform package triage (flutter#149614) Roll pub packages (flutter#149617) Fixes multi line textfield hint text gets ellipsized (flutter#148423) Support failures-only and silent reporters in `flutter test` (flutter#148739) [CupertinoActionSheet] Fix overflow of the overscroll section when the user scrolls far (flutter#149542) Fix InputDecorator.prefixIcon color when disabled (flutter#149595) Added filter callback on dropdown menu (flutter#143939) update generated localized message files in the stocks test app (flutter#148741) Add a simplified SimpleCascadingMenuApp example (flutter#149147) Reland "Prevent LayoutBuilder from rebuilding more than once (flutter#147856)" (flutter#149303) Move some benchmarks from MotoG4 to Mokey (flutter#149567) Roll Packages from d8e8e8c to 11e192a (2 revisions) (flutter#149596) Cleanup triage reports from docs/ (flutter#149545) Roll Flutter Engine from d81edf635a9f to ea72558be758 (1 revision) (flutter#149590) Roll Flutter Engine from b0f4d7459708 to d81edf635a9f (1 revision) (flutter#149468) Roll Flutter Engine from 40b868efcc46 to b0f4d7459708 (1 revision) (flutter#149467) ...

…/flutter#147856)

| Problem | Before | After | | --- | --- | --- | | Width | <img width="797" alt="Screenshot 2024-02-09 at 1 29 09 PM" src="https://github.com/flutter/flutter/assets/389558/c49fa584-2550-41f6-ab80-6c20d01412b1"> | <img width="794" alt="Screenshot 2024-02-09 at 1 23 59 PM" src="https://github.com/flutter/flutter/assets/389558/1326f797-9883-4916-9de3-1939e7648d46"> | | Overflow | ![Screenshot from 2024-06-07 13-39-45](https://github.com/flutter/flutter/assets/389558/8a24c87a-2b5e-4bdc-8347-339d850f5a82) | ![Screenshot from 2024-06-07 13-38-26](https://github.com/flutter/flutter/assets/389558/735248aa-8969-413b-a6cf-4f9b708f9ea8) | Fixes #78746 Fixes #92851 Part of #101620 Fixes #147483 Fixes #153274 Part of Google b/317115348 Fixes optionsViewOpenDirection not working, mentioned in #143249 (comment). ### Requirements * [x] By default, the width of the options matches the width of the field. * [x] Options can be aligned to the start or end for LTR/RTL languages. * [x] The optionsViewOpenDirection parameter is respected. * [x] If the options would vertically exceed the top or bottom of the screen, they reposition themselves to fit on the screen while covering the field. At least enough to tap an option. This has accessibility implications, because sometimes an Autocomplete near the edge of a narrow screen can be unusable. * [x] If the Autocomplete is in a ScrollView, then the options move along with the field during scrolling. * [x] When the field moves or resizes, the options position and size change to match. Even if the field is animated. * [ ] The options layout updates on the same frame that the field layout changes. It's probably not possible to check all of these boxes so we'll probably need to compromise. #### Tools that I've used to try to achieve this * LayoutBuilder to provide the field constraints[^1]. * Looking up layout information of a widget via GlobalKey. * CompositedTransformFollower/Target. * CustomSingleChildLayout. [^1]: Originally this didn't work due to a bug when using LayoutBuilder with OverlayPortal (#147856). That has now been fixed. Co-authored-by: Victor Sanni <[email protected]>

| Problem | Before | After | | --- | --- | --- | | Width | <img width="797" alt="Screenshot 2024-02-09 at 1 29 09 PM" src="https://github.com/flutter/flutter/assets/389558/c49fa584-2550-41f6-ab80-6c20d01412b1"> | <img width="794" alt="Screenshot 2024-02-09 at 1 23 59 PM" src="https://github.com/flutter/flutter/assets/389558/1326f797-9883-4916-9de3-1939e7648d46"> | | Overflow | ![Screenshot from 2024-06-07 13-39-45](https://github.com/flutter/flutter/assets/389558/8a24c87a-2b5e-4bdc-8347-339d850f5a82) | ![Screenshot from 2024-06-07 13-38-26](https://github.com/flutter/flutter/assets/389558/735248aa-8969-413b-a6cf-4f9b708f9ea8) | Fixes flutter#78746 Fixes flutter#92851 Part of flutter#101620 Fixes flutter#147483 Fixes flutter#153274 Part of Google b/317115348 Fixes optionsViewOpenDirection not working, mentioned in flutter#143249 (comment). ### Requirements * [x] By default, the width of the options matches the width of the field. * [x] Options can be aligned to the start or end for LTR/RTL languages. * [x] The optionsViewOpenDirection parameter is respected. * [x] If the options would vertically exceed the top or bottom of the screen, they reposition themselves to fit on the screen while covering the field. At least enough to tap an option. This has accessibility implications, because sometimes an Autocomplete near the edge of a narrow screen can be unusable. * [x] If the Autocomplete is in a ScrollView, then the options move along with the field during scrolling. * [x] When the field moves or resizes, the options position and size change to match. Even if the field is animated. * [ ] The options layout updates on the same frame that the field layout changes. It's probably not possible to check all of these boxes so we'll probably need to compromise. #### Tools that I've used to try to achieve this * LayoutBuilder to provide the field constraints[^1]. * Looking up layout information of a widget via GlobalKey. * CompositedTransformFollower/Target. * CustomSingleChildLayout. [^1]: Originally this didn't work due to a bug when using LayoutBuilder with OverlayPortal (flutter#147856). That has now been fixed. Co-authored-by: Victor Sanni <[email protected]>

LongCatIsLooong added 4 commits April 24, 2024 08:11

wip

f62c36e

wip

831e538

wip

459cea3

api docs

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github-actions bot added framework flutter/packages/flutter repository. See also f: labels. f: scrolling Viewports, list views, slivers, etc. labels May 6, 2024

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Merge remote-tracking branch 'upstream/main' into layout-builder-buil…

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fix tests

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Autocomplete Options Width #143249

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Update widget_test.dart for an upstream LayoutBuilder fix fzyzcjy/flutter_portal#113

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For flutter/flutter#147856, commit PR: fzyzcjy/flutter_portal#113

engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Aug 6, 2024

bafdb12 Prevent LayoutBuilder from rebuilding more than once (flutter…

25cf716

…/flutter#147856)

kinex mentioned this pull request Aug 12, 2024

Flutter stable build fails with: method 'markNeedsBuild' isn't defined for the class 'RenderConstrainedLayoutBuilder' syncfusion/flutter-widgets#2008

Closed

benPesso mentioned this pull request Aug 28, 2024

App crashes with "BuildOwner.scheduleBuildFor() called inappropriately." in callback for "ext.flutter.reassemble" when hot-reloading multiple times #154060

Closed

Prevent LayoutBuilder from rebuilding more than once #147856

Prevent LayoutBuilder from rebuilding more than once #147856

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LongCatIsLooong commented May 6, 2024 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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LongCatIsLooong commented May 6, 2024 •

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