[web] Keep the keyboard up during an iOS caret drag by flutter-zl · Pull Request #190014 · flutter/flutter

flutter-zl · 2026-07-24T23:44:41Z

Problem
On iOS 27, long-press-dragging the selection caret in a Web TextField dismisses the keyboard mid-gesture. WebKit transiently blurs the hidden input with a null relatedTarget while the document keeps focus, then refocuses it a frame later,and the engine reacted to that blink on two listeners that each tore the input down. A plain input ignores the same blur, so the cause is Flutter's reaction, not a WebKit limitation.

Fix
On iOS both listeners now defer their teardown by 100ms and cancel it if the input refocuses, mirroring the existing #155265 deferred close. Done and tap-away never refocus so they still close, and the deferral is narrowed to the exact drag signature so every other focus transition is unaffected.

Demo
Before: https://flutter-demo-52-before.web.app (keyboard dismisses mid caret drag)
After: https://flutter-demo-52-after.web.app (keyboard stays up)

Repro on iOS 27 Safari: tap the field to raise the keyboard, then long-press and drag the selection caret. Before dismisses; after stays up. Done and tap-away still dismiss.

gemini-code-assist

Code Review

This pull request introduces deferred handling for focusout events and text connection closures on iOS Safari to prevent transient blurs (such as during caret or selection dragging) from prematurely dismissing the keyboard. This is achieved by implementing timers in ViewFocusBinding and DefaultTextEditingStrategy that delay the blur reporting, allowing an immediate refocus to cancel the operation. Corresponding unit tests have been added to verify these changes. There are no review comments, so I have no feedback to provide.

Renzo-Olivares

Just a few small comments. I think the overall approach looks good.

Renzo-Olivares · 2026-08-03T03:23:28Z

+/// iOS caret-drag deferral tests do not depend on the headless browser
+/// reporting the test document as focused. Mirrors
+/// `DefaultTextEditingStrategy.debugDocumentHasFocusOverride`.
+bool? debugViewFocusDocumentHasFocusOverride;


nit: I think we should add a @visibleForTesting if this is only meant to be used in tests.

I see that we do use it in the focus out listener.

I think similar to _documentVisibilityState below, we should have a seperate private variable:

flutter/engine/src/flutter/lib/web_ui/lib/src/engine/text_editing/text_editing.dart

Lines 1536 to 1543 in de01d5d

/// Overrides the result of [domDocument.visibilityState] for testing.

@visibleForTesting

String? debugDocumentVisibilityStateOverride;

bool get _documentHasFocus => debugDocumentHasFocusOverride ?? domDocument.hasFocus();

String get _documentVisibilityState =>

debugDocumentVisibilityStateOverride ?? domDocument.visibilityState;

Added a _documentHasFocus getter mirroring DefaultTextEditingStrategy._documentHasFocus, and the focusout listener reads that instead of naming the override directly.

Renzo-Olivares · 2026-08-03T04:04:37Z

+      // https://github.com/flutter/flutter/issues/189744
+      if (isIosSafari) {
+        _pendingBlurConnectionCloseTimer?.cancel();
+        _pendingBlurConnectionCloseTimer = Timer(const Duration(milliseconds: 100), () {


I think we use the same Duration(milliseconds: 100) 2 times in this file and once in view_focus_binding.dart for the same focus related reasons. Consider extracting a shared const member that can be used across both files.

Good catch. Done.

Renzo-Olivares · 2026-08-03T04:07:18Z

+      view.dom.rootElement.append(other);
+      other.focusWithoutScroll();
+      dispatchedViewFocusEvents.clear();
+


Should we be setting debugViewFocusDocumentHasFocusOverride in this test as well?

Renzo-Olivares · 2026-08-03T05:37:05Z

+  /// [ViewFocusBinding] also matches on this class to detect blurs originating
+  /// from the text-editing element, so it is a production contract, not just a
+  /// testing hook.
  static const String textEditingClass = 'flt-text-editing';


Instead of exposing this, have we considered instead adding a public member that signals this is an active text editing client to HybridTextEditing so that we don't expose this and rely on the name of a CSS class. And so the solution also works for a11y. As is it does not because I don't think flt-text-editing is added by SemanticsTextEditingStrategy only DefaultTextEditingStrategy.initializeTextEditing which is overriden by SemanticsTextEditingStrategy.

Replaced with a member on HybridTextEditing:

bool isActiveTextEditingElement(DomElement? element) => isEditing && element != null && element == strategy.domElement;

Renzo-Olivares

LGTM, w/ some small docs comments.

Renzo-Olivares · 2026-08-06T18:01:17Z

+  /// [ViewFocusBinding] uses this to recognize a `focusout` that originated
+  /// from the active text-editing element.
+  ///
+  /// Prefer this over matching on [textEditingClass]. That class is applied by


Consider shrinking this paragraph to the below in case [SemanticsTextEditingStrategy] ever changes so this documentation doesn't get stale.

/// Prefer this over matching on [textEditingClass]. That class is /// not guaranteed to be applied by all strategies.

Good suggestion. Done.

Renzo-Olivares · 2026-08-06T18:19:39Z

+///
+/// Sets the real singleton state rather than applying
+/// [HybridTextEditing.textEditingClass], so these tests exercise the same signal
+/// production code reads. The class is only applied by


Consider softening this last sentence to:

The class is not guaranteed to be applied by all text editing strategies, so keying tests off it would not reflect the prodution code.

Good suggestion. Done.

Renzo-Olivares · 2026-08-06T19:48:09Z

-    // semantics enabled the live editing element never carries it. Keying off
-    // the class left the fix dead under VoiceOver.
+    // `flt-text-editing` class, which is not guaranteed to be applied by all
+    // text editing strategies. An earlier revision matched on the class, which


nit: I would remove this last sentence it's helpful for me as a reviewer but not to contributors in the future.

or maybe change to:

Matching on the class would leave the deferral dead for strategies that do not apply it.

Good suggestion. Done.

Renzo-Olivares

LGTM, thank you for the fix!

auto-submit · 2026-08-06T21:09:56Z

autosubmit label was removed for flutter/flutter/190014, because - The status or check suite Dashboard Checks has failed. Please fix the issues identified (or deflake) before re-applying this label.

auto-submit · 2026-08-07T18:39:39Z

autosubmit label was removed for flutter/flutter/190014, because - The status or check suite Google testing has failed. Please fix the issues identified (or deflake) before re-applying this label.

auto-submit · 2026-08-07T19:45:14Z

autosubmit label was removed for flutter/flutter/190014, because - The status or check suite Google testing has failed. Please fix the issues identified (or deflake) before re-applying this label.

jtmcdole · 2026-08-11T15:18:48Z

Reason for revert: This is failing in post submit on a suppressed test. Since this is a hard failure, we should revert:

00:10 +400 ~30 -1: text_editing_test.dart: GloballyPositionedTextEditingStrategy closes the text connection on iOS when the input is not refocused after a null-relatedTarget blur [E]                 
  Expected: an object with length of <1>
    Actual: []
     Which: has length of <0>

https://logs.chromium.org/logs/flutter/buildbucket/cr-buildbucket/8673753854704709425/+/u/test:_run_suite_safari-dart2js-canvaskit-engine/stdout

flutteractionsbot · 2026-08-11T15:20:05Z

Successfully created revert PR: #190926

@jtmcdole

…190926) Reverts: [[web] Keep the keyboard up during an iOS caret drag](flutter#190014) Initiated by: @jtmcdole Reason for reverting: Original PR Author: @flutter-zl Reviewed By: @Renzo-Olivares The original PR description is provided below: Fixes flutter#189744 **Problem** On iOS 27, long-press-dragging the selection caret in a Web TextField dismisses the keyboard mid-gesture. WebKit transiently blurs the hidden input with a null relatedTarget while the document keeps focus, then refocuses it a frame later,and the engine reacted to that blink on two listeners that each tore the input down. A plain input ignores the same blur, so the cause is Flutter's reaction, not a WebKit limitation. **Fix** On iOS both listeners now defer their teardown by 100ms and cancel it if the input refocuses, mirroring the existing flutter#155265 deferred close. Done and tap-away never refocus so they still close, and the deferral is narrowed to the exact drag signature so every other focus transition is unaffected. **Demo** Before: https://flutter-demo-52-before.web.app (keyboard dismisses mid caret drag) After: https://flutter-demo-52-after.web.app (keyboard stays up) Repro on iOS 27 Safari: tap the field to raise the keyboard, then long-press and drag the selection caret. Before dismisses; after stays up. Done and tap-away still dismiss.

…#190942) Fixes flutter#189744 **Reland of flutter#190014, reverted in flutter#190926.** Cause: three of the new tests dispatch a real input.blur(), but desktop Safari uses SafariDesktopTextEditingStrategy, which does not subscribe to blur, so handleBlur never ran. Real iOS does subscribe, so the fix itself was unaffected. Delta: one test-only commit adding skip: isSafari to those three tests. No production change. **Problem** On iOS 27, long-press-dragging the selection caret in a Web TextField dismisses the keyboard mid-gesture. WebKit transiently blurs the hidden input with a null relatedTarget while the document keeps focus, then refocuses it a frame later,and the engine reacted to that blink on two listeners that each tore the input down. A plain input ignores the same blur, so the cause is Flutter's reaction, not a WebKit limitation. **Fix** On iOS both listeners now defer their teardown by 100ms and cancel it if the input refocuses, mirroring the existing flutter#155265 deferred close. Done and tap-away never refocus so they still close, and the deferral is narrowed to the exact drag signature so every other focus transition is unaffected. **Demo** Before: https://flutter-demo-52-before.web.app/ (keyboard dismisses mid caret drag) After: https://flutter-demo-52-after.web.app/ (keyboard stays up) Repro on iOS 27 Safari: tap the field to raise the keyboard, then long-press and drag the selection caret. Before dismisses; after stays up. Done and tap-away still dismiss.

[web] Keep the keyboard up during an iOS caret drag

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flutter-dashboard Bot added the CICD Run CI/CD label Jul 24, 2026

github-actions Bot added a: text input Entering text in a text field or keyboard related problems engine flutter/engine related. See also e: labels. platform-web Web applications specifically f: focus Focus traversal, gaining or losing focus team-web Owned by Web platform team labels Jul 24, 2026

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flutter-zl added 2 commits July 24, 2026 16:48

Merge branch 'master' into issue_189744_fix

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Merge branch 'master' into issue_189744_fix

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flutter-zl requested a review from Renzo-Olivares July 27, 2026 17:13

flutter-zl mentioned this pull request Jul 29, 2026

[web] iOS 27: TextField cursor sticks when dragging the caret after text is selected #190242

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flutter-zl added 2 commits August 5, 2026 12:21

Merge branch 'master' into issue_189744_fix

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[web] Key caret-drag deferral off editing state, not CSS class

b1d5e63

flutter-zl force-pushed the issue_189744_fix branch from 5eb2bf6 to b1d5e63 Compare August 5, 2026 20:04

Renzo-Olivares previously approved these changes Aug 6, 2026

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[web] Avoid naming specific strategies in caret-drag docs

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flutter-zl dismissed Renzo-Olivares’s stale review via c0c762f August 6, 2026 19:31

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Merge branch 'master' into issue_189744_fix

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[web] Drop reviewer-facing history from a test comment

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Roll Flutter from 27b098811f3b to 24240702e683 (123 revisions) flutter/packages#12431

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Revert: [web] Keep the keyboard up during an iOS caret drag #190926

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Roll Flutter from 27b098811f3b to dc0a602f0ed1 (124 revisions) flutter/packages#12433

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Roll Flutter from 27b098811f3b to 4f85c1701be3 (128 revisions) flutter/packages#12434

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Reland "[web] Keep the keyboard up during an iOS caret drag" #190942

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flutter_tools: validate plugin identifiers before generating registrant code #190462

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[web] Fix password-manager autofill not reaching text fields #190126

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	/// Overrides the result of [domDocument.visibilityState] for testing.
	@visibleForTesting
	String? debugDocumentVisibilityStateOverride;

	bool get _documentHasFocus => debugDocumentHasFocusOverride ?? domDocument.hasFocus();

	String get _documentVisibilityState =>
	debugDocumentVisibilityStateOverride ?? domDocument.visibilityState;

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flutter-zl commented Jul 24, 2026 •

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