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[Windows] Keep regular windows in place when another is activated by 9AZX · Pull Request #188016 · flutter/flutter · GitHub
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[Windows] Keep regular windows in place when another is activated - #188016

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knopp merged 9 commits into
flutter:masterfrom
9AZX:fix_window_focus_win32
Jul 2, 2026
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[Windows] Keep regular windows in place when another is activated#188016
knopp merged 9 commits into
flutter:masterfrom
9AZX:fix_window_focus_win32

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@9AZX

@9AZX 9AZX commented Jun 15, 2026 •
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fix #187436

On Windows with multi-window enabled, activating a regular window pulled other regular windows forward in the z-order (and could steal focus back), even though they are independent. The causes span the engine and the framework:

  • Engine: the base WM_ACTIVATE handler refocused a window's own view on deactivation, reactivating it. The activation logic is now shared with the dialog handler and skips refocusing on WA_INACTIVE
  • Framework: when a view is rendered inside another (via ViewAnchor), its FocusScope nested under the parent view's scope, so the parent reported hasFocus whenever a child view was focused and asked the engine to focus its window. Each view now attaches its focus subtree to the root scope (new FocusTraversalGroup.parentNode), so each view is an independent focus root. This also fixes moving focus from a child view back to a parent view.
  • Framework: on desktop, the focus suspended when the app goes inactive was restored on resume even if another window had been activated meanwhile, stealing focus back. It now restores only when nothing else has claimed focus.

Tested manually on Windows 11 with examples/multiple_windows

Screen.Recording.2026-06-15.at.14.26.39.mov

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@9AZX
9AZX requested a review from a team as a code owner June 15, 2026 12:35
@github-actions github-actions Bot added engine flutter/engine related. See also e: labels. platform-windows Building on or for Windows specifically a: desktop Running on desktop team-windows Owned by the Windows platform team labels Jun 15, 2026
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Code Review

This pull request modifies window focus and activation handling on Windows to prevent unexpected window reactivation and z-order changes. It updates FlutterWindow::Focus to only apply focus if the top-level window is already active, ignores unfocus requests in FlutterWindowsEngine::OnViewFocusChangeRequest, and consolidates window activation logic into HostWindow::HandleWindowActivation to prevent deactivated windows from reactivating themselves. Unit tests are added to verify these behaviors. No review comments were provided, and there is no feedback to address.

mattkae
mattkae reviewed Jun 15, 2026
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One question!

Comment thread engine/src/flutter/shell/platform/windows/host_window.h Resolved
Comment thread engine/src/flutter/shell/platform/windows/flutter_window.cc Resolved
mattkae
mattkae previously approved these changes Jun 15, 2026
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Nice fix! This makes sense to me. @loic-sharma do you care to chime in for a Googler review?

@mattkae
mattkae requested a review from loic-sharma June 15, 2026 17:39
loic-sharma
loic-sharma reviewed Jun 15, 2026
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Comment thread engine/src/flutter/shell/platform/windows/flutter_windows_engine.cc Resolved
@github-actions github-actions Bot added the framework flutter/packages/flutter repository. See also f: labels. label Jun 16, 2026
@9AZX
9AZX requested a review from loic-sharma June 16, 2026 14:15
loic-sharma
loic-sharma reviewed Jun 16, 2026
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Comment thread packages/flutter/lib/src/widgets/view.dart Resolved
loic-sharma
loic-sharma reviewed Jun 16, 2026
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Comment thread packages/flutter/lib/src/widgets/view.dart Resolved
@9AZX
9AZX requested a review from loic-sharma June 17, 2026 16:10
@github-actions github-actions Bot added the f: focus Focus traversal, gaining or losing focus label Jun 17, 2026
@9AZX
9AZX force-pushed the fix_window_focus_win32 branch from e6fe62b to 6f4d065 Compare June 22, 2026 15:41
@mattkae
mattkae requested a review from knopp June 22, 2026 18:00
loic-sharma
loic-sharma reviewed Jun 23, 2026
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Comment thread packages/flutter/test/widgets/focus_manager_test.dart Resolved
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Comment thread packages/flutter/lib/src/widgets/focus_manager.dart Resolved
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loic-sharma commented Jun 23, 2026

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This looks good to me, but I'd like to get reviews from other folks as well.

@9AZX Could you update this PR's description to describe the latest implementation? This will make it easier to understand these changes when in the future when we're looking back at the history :)

loic-sharma
loic-sharma reviewed Jun 23, 2026
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Comment thread packages/flutter/lib/src/widgets/focus_traversal.dart Resolved
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loic-sharma requested a review from justinmc June 24, 2026 00:00
@9AZX
9AZX force-pushed the fix_window_focus_win32 branch from 0c3d207 to 10686a9 Compare June 24, 2026 08:25
@9AZX
9AZX requested a review from loic-sharma June 24, 2026 20:29
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This looks good to me, excellent work!

@loic-sharma loic-sharma added the CICD Run CI/CD label Jun 26, 2026
mattkae
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Looks great to me! This should meaningfully solve some other focus problems that we have. @knopp may also want to take a look at this, but this looks correct to me.

knopp
knopp requested changes Jun 29, 2026
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Comment thread packages/flutter/lib/src/widgets/view.dart
// an independent focus root: nesting would otherwise make an ancestor
// view report hasFocus when a descendant view is focused, causing it
// to request native focus and pull its window forward.
parentNode: FocusManager.instance.rootScope,

@knopp knopp Jun 29, 2026

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I am not sure how I feel about this. In some cases, with independent windows, you want to have separate focus tree. But in other cases, like popovers you don't. I'm wondering if the root of the issue is that the view is anchored at the wrong place in widget hierarchy. I think the WindowManager hosted by the application right now is not a good solution - it causes other issues as well, i.e. widget inspector not working in other than the first window.

I think we might want to take a step back and figure out if it wouldn't be better to have an Material/WidgetsApp per window, which would also take care of the focus issue.

@justinmc justinmc Jul 1, 2026

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I agree that this may be a sign that the whole widget tree structure has a problem, not just the focus tree.

Maybe instead of a WidgetsApp per window we could split out the window-specific stuff into a new widget (WidgetsWindow...?). There is a bunch of stuff inside of WidgetsApp that probably makes sense to be defined at the app-level (keyboard shortcuts, localizations, state restoration, etc.) while focus makes more sense at the widgets-level. I haven't looked into the details of whether this is possible but just an idea.

@knopp knopp Jul 1, 2026 •
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I have a WIP PR for moving window manager outside of WidgetsApp. Yes, ideally we might want to share some things for all windows, but I think in the meanwhile having shortcuts etc defined per window is less of a problem that things weirdly failing (like focus issue here or turning on widget inspector literally breaking updating of secondary windows, or even mere the existence of "secondary" windows...)

auto-merge was automatically disabled July 2, 2026 07:33

Head branch was pushed to by a user without write access

@9AZX
9AZX force-pushed the fix_window_focus_win32 branch from b9af7c8 to b34f7ea Compare July 2, 2026 07:33
@flutter-dashboard flutter-dashboard Bot removed the CICD Run CI/CD label Jul 2, 2026
@knopp knopp added the CICD Run CI/CD label Jul 2, 2026
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knopp enabled auto-merge July 2, 2026 12:00
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Merged via the queue into flutter:master with commit 48d9105 Jul 2, 2026
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Manual roll Flutter from ca9f874f5284 to 6995038d96ef (44 revisions)

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flutter/flutter@ca9f874...6995038

2026-07-03 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from sx_eN0J_f2BV6jqjW... to Jr08vyeibMSv3Oxst... (flutter/flutter#188946)
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2026-07-03 engine-flutter-autoroll@skia.org Roll Skia from 5358ab75b840 to 919956953af6 (7 revisions) (flutter/flutter#188943)
2026-07-02 j.ihlas@betclicgroup.com [Windows] Keep regular windows in place when another is activated (flutter/flutter#188016)
2026-07-02 okorohelijah@google.com [flutter_tools] Provide guided message when iOS/macOS build fails due to low minimum version (flutter/flutter#188812)
2026-07-02 bdero@google.com [Flutter GPU] Load a ShaderLibrary from shader bundle bytes (flutter/flutter#188596)
2026-07-02 dacoharkes@google.com [tool] Enable record_use experiment by default on all channels (flutter/flutter#188887)
2026-07-02 engine-flutter-autoroll@skia.org Roll Packages from e742106 to 420e135 (13 revisions) (flutter/flutter#188916)
2026-07-02 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from I2h2eXk06RrA3pIG2... to sx_eN0J_f2BV6jqjW... (flutter/flutter#188915)
2026-07-02 256906086+mvincentong@users.noreply.github.com Clarify layout callback debug flag docs (flutter/flutter#186879)
2026-07-02 engine-flutter-autoroll@skia.org Roll Skia from 0c4faca350cc to 5358ab75b840 (2 revisions) (flutter/flutter#188899)
2026-07-02 engine-flutter-autoroll@skia.org Roll Dart SDK from e47361c7fe9a to 786212a2ce0d (2 revisions) (flutter/flutter#188898)
2026-07-01 engine-flutter-autoroll@skia.org Roll Skia from 0fc8ba72e802 to 0c4faca350cc (2 revisions) (flutter/flutter#188886)
2026-07-01 robert.ancell@canonical.com Hide draft PRs from the triage list (flutter/flutter#188885)
2026-07-01 47866232+chunhtai@users.noreply.github.com Stricten isSemantics and matchesSemantics children mismatch check (flutter/flutter#188827)
2026-07-01 jesswon@google.com [AGP 9] Support Enabling Built-in Kotlin (flutter/flutter#188543)
2026-07-01 engine-flutter-autoroll@skia.org Roll Skia from d19e557ac317 to 0fc8ba72e802 (4 revisions) (flutter/flutter#188879)
2026-07-01 bkonyi@google.com [ci] Increase test timeout for Mac_x64 build_tests shards (flutter/flutter#188804)
2026-07-01 engine-flutter-autoroll@skia.org Roll Skia from bd4ae38ca3bb to d19e557ac317 (1 revision) (flutter/flutter#188865)
2026-07-01 engine-flutter-autoroll@skia.org Roll Dart SDK from 26d723eb89af to e47361c7fe9a (5 revisions) (flutter/flutter#188864)
2026-07-01 katelovett@google.com Update triage links for material_ui and cupertino_ui --> Design triage (flutter/flutter#188567)
2026-07-01 flar@google.com [Impeller] Share a single ContextGLES among all PlaygroundImplGLES (flutter/flutter#188080)
2026-07-01 homobonus-luca@hotmail.it Use null-aware elements in dev/devicelab/lib/integration_tests.dart (flutter/flutter#187852)
2026-07-01 engine-flutter-autoroll@skia.org Roll Packages from 274ed3e to e742106 (18 revisions) (flutter/flutter#188863)
2026-07-01 116356835+AbdeMohlbi@users.noreply.github.com Add android 17 to embedding (flutter/flutter#187965)
2026-07-01 47866232+chunhtai@users.noreply.github.com Adds semantics role check to isSemantics and matchesSemantics (flutter/flutter#188825)
2026-07-01 rmacnak@google.com Roll Dart SDK from e1bdb9ce3327 to 26d723eb89af (3 revisions) (flutter/flutter#188795)
2026-07-01 zhongliu88889@gmail.com [web] Apply autocapitalize to text editing elements (flutter/flutter#188351)
2026-07-01 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from RymJjIj7dd5vQ3Cnh... to I2h2eXk06RrA3pIG2... (flutter/flutter#188852)
2026-07-01 bdero@google.com [Impeller] Compute dispatch takes 3D workgroup counts and honors the shader local_size (flutter/flutter#188601)
2026-07-01 codedoctor@linwood.dev Improve stylus support on linux (flutter/flutter#186831)
2026-07-01 matt.boetger@gmail.com Resolve issue  Catch am start failures with 'Error type' and prevent hang (flutter/flutter#187196)
2026-07-01 engine-flutter-autoroll@skia.org Roll Skia from ef178c9898af to bd4ae38ca3bb (3 revisions) (flutter/flutter#188834)
2026-07-01 engine-flutter-autoroll@skia.org Roll Skia from 3ac99be47229 to ef178c9898af (3 revisions) (flutter/flutter#188831)
2026-07-01 31859944+LongCatIsLooong@users.noreply.github.com Add a macosArm64Only feature flag (flutter/flutter#188598)
2026-07-01 engine-flutter-autoroll@skia.org Roll Skia from 15302f1625b2 to 3ac99be47229 (1 revision) (flutter/flutter#188819)
2026-07-01 bkonyi@google.com [flutter_tools] Track asset transformer dependencies for hot reload (Reland #187947) (flutter/flutter#188808)
2026-06-30 737941+loic-sharma@users.noreply.github.com Add TapRegion samples (flutter/flutter#188685)
2026-06-30 31859944+LongCatIsLooong@users.noreply.github.com Print a warning in `flutter doctor` when running on Intel Macs (flutter/flutter#188760)
2026-06-30 zhongliu88889@gmail.com [framework] Keep scrollable semantics role stable (flutter/flutter#187963)
2026-06-30 1961493+harryterkelsen@users.noreply.github.com feat(skills): Add shepherd-prs skill for managing approved external contributor PRs (flutter/flutter#188534)
2026-06-30 engine-flutter-autoroll@skia.org Roll Skia from 71947c4110b0 to 15302f1625b2 (17 revisions) (flutter/flutter#188815)
2026-06-30 bkonyi@google.com [Tool] Run re-entrant upgrade in original CWD (flutter/flutter#188794)
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kalyujniy pushed a commit to brickit-app/camera that referenced this pull request Jul 8, 2026
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Manual roll Flutter from ca9f874f5284 to 6995038d96ef (44 revisions) (f…
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Manual roll Flutter from ca9f874f5284 to 6995038d96ef (44 revisions)

Manual roll requested by stuartmorgan@google.com

flutter/flutter@ca9f874...6995038

2026-07-03 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from sx_eN0J_f2BV6jqjW... to Jr08vyeibMSv3Oxst... (flutter/flutter#188946)
2026-07-03 engine-flutter-autoroll@skia.org Roll Packages from 420e135 to 2fbe873 (1 revision) (flutter/flutter#188945)
2026-07-03 engine-flutter-autoroll@skia.org Roll Dart SDK from 786212a2ce0d to 1f9a08ce0638 (4 revisions) (flutter/flutter#188944)
2026-07-03 engine-flutter-autoroll@skia.org Roll Skia from 5358ab75b840 to 919956953af6 (7 revisions) (flutter/flutter#188943)
2026-07-02 j.ihlas@betclicgroup.com [Windows] Keep regular windows in place when another is activated (flutter/flutter#188016)
2026-07-02 okorohelijah@google.com [flutter_tools] Provide guided message when iOS/macOS build fails due to low minimum version (flutter/flutter#188812)
2026-07-02 bdero@google.com [Flutter GPU] Load a ShaderLibrary from shader bundle bytes (flutter/flutter#188596)
2026-07-02 dacoharkes@google.com [tool] Enable record_use experiment by default on all channels (flutter/flutter#188887)
2026-07-02 engine-flutter-autoroll@skia.org Roll Packages from e742106 to 420e135 (13 revisions) (flutter/flutter#188916)
2026-07-02 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from I2h2eXk06RrA3pIG2... to sx_eN0J_f2BV6jqjW... (flutter/flutter#188915)
2026-07-02 256906086+mvincentong@users.noreply.github.com Clarify layout callback debug flag docs (flutter/flutter#186879)
2026-07-02 engine-flutter-autoroll@skia.org Roll Skia from 0c4faca350cc to 5358ab75b840 (2 revisions) (flutter/flutter#188899)
2026-07-02 engine-flutter-autoroll@skia.org Roll Dart SDK from e47361c7fe9a to 786212a2ce0d (2 revisions) (flutter/flutter#188898)
2026-07-01 engine-flutter-autoroll@skia.org Roll Skia from 0fc8ba72e802 to 0c4faca350cc (2 revisions) (flutter/flutter#188886)
2026-07-01 robert.ancell@canonical.com Hide draft PRs from the triage list (flutter/flutter#188885)
2026-07-01 47866232+chunhtai@users.noreply.github.com Stricten isSemantics and matchesSemantics children mismatch check (flutter/flutter#188827)
2026-07-01 jesswon@google.com [AGP 9] Support Enabling Built-in Kotlin (flutter/flutter#188543)
2026-07-01 engine-flutter-autoroll@skia.org Roll Skia from d19e557ac317 to 0fc8ba72e802 (4 revisions) (flutter/flutter#188879)
2026-07-01 bkonyi@google.com [ci] Increase test timeout for Mac_x64 build_tests shards (flutter/flutter#188804)
2026-07-01 engine-flutter-autoroll@skia.org Roll Skia from bd4ae38ca3bb to d19e557ac317 (1 revision) (flutter/flutter#188865)
2026-07-01 engine-flutter-autoroll@skia.org Roll Dart SDK from 26d723eb89af to e47361c7fe9a (5 revisions) (flutter/flutter#188864)
2026-07-01 katelovett@google.com Update triage links for material_ui and cupertino_ui --> Design triage (flutter/flutter#188567)
2026-07-01 flar@google.com [Impeller] Share a single ContextGLES among all PlaygroundImplGLES (flutter/flutter#188080)
2026-07-01 homobonus-luca@hotmail.it Use null-aware elements in dev/devicelab/lib/integration_tests.dart (flutter/flutter#187852)
2026-07-01 engine-flutter-autoroll@skia.org Roll Packages from 274ed3e to e742106 (18 revisions) (flutter/flutter#188863)
2026-07-01 116356835+AbdeMohlbi@users.noreply.github.com Add android 17 to embedding (flutter/flutter#187965)
2026-07-01 47866232+chunhtai@users.noreply.github.com Adds semantics role check to isSemantics and matchesSemantics (flutter/flutter#188825)
2026-07-01 rmacnak@google.com Roll Dart SDK from e1bdb9ce3327 to 26d723eb89af (3 revisions) (flutter/flutter#188795)
2026-07-01 zhongliu88889@gmail.com [web] Apply autocapitalize to text editing elements (flutter/flutter#188351)
2026-07-01 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from RymJjIj7dd5vQ3Cnh... to I2h2eXk06RrA3pIG2... (flutter/flutter#188852)
2026-07-01 bdero@google.com [Impeller] Compute dispatch takes 3D workgroup counts and honors the shader local_size (flutter/flutter#188601)
2026-07-01 codedoctor@linwood.dev Improve stylus support on linux (flutter/flutter#186831)
2026-07-01 matt.boetger@gmail.com Resolve issue  Catch am start failures with 'Error type' and prevent hang (flutter/flutter#187196)
2026-07-01 engine-flutter-autoroll@skia.org Roll Skia from ef178c9898af to bd4ae38ca3bb (3 revisions) (flutter/flutter#188834)
2026-07-01 engine-flutter-autoroll@skia.org Roll Skia from 3ac99be47229 to ef178c9898af (3 revisions) (flutter/flutter#188831)
2026-07-01 31859944+LongCatIsLooong@users.noreply.github.com Add a macosArm64Only feature flag (flutter/flutter#188598)
2026-07-01 engine-flutter-autoroll@skia.org Roll Skia from 15302f1625b2 to 3ac99be47229 (1 revision) (flutter/flutter#188819)
2026-07-01 bkonyi@google.com [flutter_tools] Track asset transformer dependencies for hot reload (Reland #187947) (flutter/flutter#188808)
2026-06-30 737941+loic-sharma@users.noreply.github.com Add TapRegion samples (flutter/flutter#188685)
2026-06-30 31859944+LongCatIsLooong@users.noreply.github.com Print a warning in `flutter doctor` when running on Intel Macs (flutter/flutter#188760)
2026-06-30 zhongliu88889@gmail.com [framework] Keep scrollable semantics role stable (flutter/flutter#187963)
2026-06-30 1961493+harryterkelsen@users.noreply.github.com feat(skills): Add shepherd-prs skill for managing approved external contributor PRs (flutter/flutter#188534)
2026-06-30 engine-flutter-autoroll@skia.org Roll Skia from 71947c4110b0 to 15302f1625b2 (17 revisions) (flutter/flutter#188815)
2026-06-30 bkonyi@google.com [Tool] Run re-entrant upgrade in original CWD (flutter/flutter#188794)
...
@Piinks Piinks mentioned this pull request Jul 10, 2026
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@knopp knopp knopp approved these changes
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a: desktop Running on desktop CICD Run CI/CD engine flutter/engine related. See also e: labels. f: focus Focus traversal, gaining or losing focus framework flutter/packages/flutter repository. See also f: labels. platform-windows Building on or for Windows specifically team-windows Owned by the Windows platform team

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[Windows][windowing] Activating a child RegularWindow from the taskbar briefly focuses it, then the main window is brought to front

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