[web] Fix empty first frame in multiview mode #172493

mdebbar · 2025-07-21T21:34:18Z

The issue was caused by a stale EngineFlutterView.physicalSize that happened to be Size(0, 0) making rendering a no-op in the first frame.

Fixes #172397

yjbanov

…r#172493)

The issue was caused by a stale `EngineFlutterView.physicalSize` that happened to be `Size(0, 0)` making rendering a no-op in the first frame. Fixes flutter#172397

…r#172493)

Roll Flutter from 20788c0 to cfbaa18 (43 revisions) flutter/flutter@20788c0...cfbaa18 2025-07-28 git@reki.re Remove shortner (flutter/flutter#172844) 2025-07-28 matanlurey@users.noreply.github.com Update `flutter pub get` to use `flutter.version.json` (instead of `version`) (flutter/flutter#172798) 2025-07-27 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from i7RS-4iBtdndwa3Jy... to tK_PAaLeo0pUxi8hv... (flutter/flutter#172827) 2025-07-26 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from 4IewCwqcEm7r4QsXd... to i7RS-4iBtdndwa3Jy... (flutter/flutter#172808) 2025-07-26 98614782+auto-submit[bot]@users.noreply.github.com Reverts "fix: get content hash for master on local engine branches (#172792)" (flutter/flutter#172805) 2025-07-26 codefu@google.com fix: build size_exp artifacts in post (flutter/flutter#172802) 2025-07-26 codefu@google.com fix: get content hash for master on local engine branches (flutter/flutter#172792) 2025-07-25 matanlurey@users.noreply.github.com Update `main`/`master` repoExceptions analysis set (flutter/flutter#172796) 2025-07-25 matanlurey@users.noreply.github.com Remove deprecated `--[no-]-disable-dds` (flutter/flutter#172791) 2025-07-25 matanlurey@users.noreply.github.com `last_engine_commit.ps1`: Use `$flutterRoot` instead of `$gitTopLevel` (flutter/flutter#172786) 2025-07-25 matanlurey@users.noreply.github.com Check file contents, remove tests that are now invalid (`: 'none'`) (flutter/flutter#172788) 2025-07-25 loic.peron@inetum.com windows: allow pwsh.bat wrapper (flutter/flutter#171778) 2025-07-25 bdero@google.com [Impeller] Log glCheckFrameBufferStatus output when it fails in blit pass. (flutter/flutter#172592) 2025-07-25 matanlurey@users.noreply.github.com Remove deprecated `AssetManifest.json` file (flutter/flutter#172594) 2025-07-25 matanlurey@users.noreply.github.com Refactor `verifyVersion` into typed `Version` object, use it (flutter/flutter#172780) 2025-07-25 jmccandless@google.com Bump the customer tests to pick up an update to Zulip's tests, for th… (flutter/flutter#172733) 2025-07-25 matanlurey@users.noreply.github.com Rename `AppRunLogger`, stop writing status messages that break JSON (flutter/flutter#172591) 2025-07-25 matanlurey@users.noreply.github.com Add `--dart-define`, `-D` to `assemble`, deprecate `--define`, `-d`. (flutter/flutter#172510) 2025-07-25 rmolivares@renzo-olivares.dev Fix previous text input connection interrupts enter/space (flutter/flutter#171973) 2025-07-25 1063596+reidbaker@users.noreply.github.com Update CHANGELOG.md for 3.32.8 (flutter/flutter#172779) 2025-07-25 matanlurey@users.noreply.github.com Fix an `omit-type` lint that is breaking the tree (flutter/flutter#172776) 2025-07-25 reynaldots@gmail.com feat(tool): Respect user-data-dir flag from web-browser-flag (flutter/flutter#169445) 2025-07-25 mdebbar@google.com [web] Fix empty first frame in multiview mode (flutter/flutter#172493) 2025-07-25 jssaadeh@outlook.com Migrate to null aware elements - Part 3 (flutter/flutter#172307) 2025-07-25 mdebbar@google.com Update few links in docs (flutter/flutter#172166) 2025-07-25 engine-flutter-autoroll@skia.org Roll Skia from 768ace3fd144 to 409e1c7ba09b (1 revision) (flutter/flutter#172745) 2025-07-25 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from a_55b5hqpRnigzuNC... to 4IewCwqcEm7r4QsXd... (flutter/flutter#172742) 2025-07-25 engine-flutter-autoroll@skia.org Roll Skia from 094ac350125f to 768ace3fd144 (18 revisions) (flutter/flutter#172735) 2025-07-25 matanlurey@users.noreply.github.com Remove 2023 deprecated `'platforms'` key from daemon output (flutter/flutter#172593) 2025-07-24 a-siva@users.noreply.github.com Manual roll of Dart from 26dece893751 to 5ede85aff798 (flutter/flutter#172731) 2025-07-24 ievdokdm@gmail.com 169108 ci debug (flutter/flutter#172589) 2025-07-24 31685655+SalehTZ@users.noreply.github.com Improve assertion message in `_MixedBorderRadius.resolve()` (flutter/flutter#172100) 2025-07-24 ahmedsameha1@gmail.com Make sure that a BottomAppBar doesn't crash in 0x0 environment (flutter/flutter#172097) 2025-07-24 ahmedsameha1@gmail.com Handle#6537 bottom navigation bar (flutter/flutter#172404) 2025-07-24 ahmedsameha1@gmail.com Make sure that a MaterialBanner doesn't crash in 0x0 environment (flutter/flutter#172074) 2025-07-24 matanlurey@users.noreply.github.com Remove support for `pluginClass: none` (on `master`; `> 3.35.0`) (flutter/flutter#172579) 2025-07-24 ahmedsameha1@gmail.com Make sure that a Card doesn't crash in 0x0 environment (flutter/flutter#172373) 2025-07-24 ahmedsameha1@gmail.com Make sure that an AboutDialog doesn't crash in 0x0 environment (flutter/flutter#172444) 2025-07-24 ahmedsameha1@gmail.com Make sure that an ActionChip doesn't crash in 0x0 environment (flutter/flutter#172684) 2025-07-24 matanlurey@users.noreply.github.com Delete (unused) `dev/checks_tool` directory (flutter/flutter#172715) 2025-07-24 34871572+gmackall@users.noreply.github.com [Android] Add missing ci configuration for `Linux android_java17_tool_integration_tests` (flutter/flutter#172702) 2025-07-24 srawlins@google.com Flutter-Cherrypick-Process.md - Spell cherry-pick consistently (flutter/flutter#172697) 2025-07-24 matanlurey@users.noreply.github.com Bringup `linux_web_engine_tests`; failing 4+ times in a row (flutter/flutter#172714) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: ...

The issue was caused by a stale `EngineFlutterView.physicalSize` that happened to be `Size(0, 0)` making rendering a no-op in the first frame. Fixes flutter#172397

…r#172493)

The issue was caused by a stale `EngineFlutterView.physicalSize` that happened to be `Size(0, 0)` making rendering a no-op in the first frame. Fixes flutter#172397

Fixes #175074 There was an implicit expectation in the resizing code: When the virtual keyboard is up on mobile, the view's `physicalSize` remains fixed, and any resizes (presumably caused by the virtual keyboard itself) should be considered as `viewInsets`. This expectation was broken inadvertently by my PR: #172493 <hr> The sequence of events that lead to the reported issue: 1. View's physical size is calculated based on window size. 2. Text editing starts, virtual keyboard comes up. 3. View's physical size remains unchanged, and the difference caused by the keyboard is reported as view insets to the framework. 4. (so far so good). 5. When `resizeToAvoidBottomInset` is true, the framework will re-render its content to fit the available size. 6. The new render call comes with a new size that's basically `physical height - bottom inset`. 7. The engine takes that new size and applies it to the DOM. 8. (now the view's DOM element has been resized incorrectly). 9. ... 10. Eventually, this leads to the new insets being calculated incorrectly resulting in negative insets which cause the framework to throw. <hr> The fix involves the following: 1. Respect the expectation mentioned above: when the keyboard is up, view's physical size should remain unchanged. 2. *_If_* we ever end up with negative insets, catch it earlier in the engine so it's easier to debug the root cause. 3. New regression test.

Fixes flutter#175074 There was an implicit expectation in the resizing code: When the virtual keyboard is up on mobile, the view's `physicalSize` remains fixed, and any resizes (presumably caused by the virtual keyboard itself) should be considered as `viewInsets`. This expectation was broken inadvertently by my PR: flutter#172493 <hr> The sequence of events that lead to the reported issue: 1. View's physical size is calculated based on window size. 2. Text editing starts, virtual keyboard comes up. 3. View's physical size remains unchanged, and the difference caused by the keyboard is reported as view insets to the framework. 4. (so far so good). 5. When `resizeToAvoidBottomInset` is true, the framework will re-render its content to fit the available size. 6. The new render call comes with a new size that's basically `physical height - bottom inset`. 7. The engine takes that new size and applies it to the DOM. 8. (now the view's DOM element has been resized incorrectly). 9. ... 10. Eventually, this leads to the new insets being calculated incorrectly resulting in negative insets which cause the framework to throw. <hr> The fix involves the following: 1. Respect the expectation mentioned above: when the keyboard is up, view's physical size should remain unchanged. 2. *_If_* we ever end up with negative insets, catch it earlier in the engine so it's easier to debug the root cause. 3. New regression test.

[web] Fix empty first frame in multiview mode

889b75e

github-actions bot added engine flutter/engine related. See also e: labels. platform-web Web applications specifically labels Jul 21, 2025

mdebbar requested review from ditman and yjbanov July 22, 2025 16:16

yjbanov approved these changes Jul 22, 2025

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Merge branch 'master' into empty_first_frame

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Merged via the queue into flutter:master with commit c1c38ad Jul 25, 2025
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Roll Flutter from 20788c07fcb8 to c1c38adec6c5 (21 revisions) flutter/packages#9675

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c1c38ad [web] Fix empty first frame in multiview mode (flutter/flutte…

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Roll Flutter from 20788c07fcb8 to aea660d5cd59 (22 revisions) flutter/packages#9676

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Roll Flutter from 20788c07fcb8 to b42ef815987c (40 revisions) flutter/packages#9682

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[web] Fix resizeToAvoidBottomInset on Android web #179581

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