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fix(ui): keep web text selection stable across browser context menu toggles - #2909
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…oggles `SelectableRegion` restructures its subtree depending on whether the browser's native context menu is enabled, so flipping that setting while a `SelectionArea` is mounted trips an assertion on web (flutter/flutter#186459, fixed on main but not in any released Flutter). `ContextMenuRegion` flipped that process-wide setting from `initState` and `dispose`, and it is mounted once per message, so opening a channel toggled it under the message text selection areas and any later rebuild — such as tapping the attachment button — crashed. Key the selection area on the setting so a flip recreates it, and reference count the suppression so it is only released once the last region unmounts. The missing reference count was also restoring the native menu as soon as a single message scrolled out of the list or was deleted, and re-enabling it in apps that had deliberately disabled it. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Included review availability: Your plan provides up to 4 included reviews per hour; 3 remain after this review. 📝 WalkthroughWalkthroughThe PR fixes web selectable-message rebuild crashes and browser context-menu restoration. It adds shared suppression tracking, preserves the initial browser setting, keys ChangesWeb context menu fixes
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to The change replaces the selection region when the browser-menu setting changes and reference-counts restoration. It is mergeable with explicit owner awareness that the VM suite cannot exercise the web-only transition, leaving a bounded risk that regressions in that path could go undetected. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Actionable comments posted: 1
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Inline comments:
In
`@packages/stream_chat_flutter/test/src/message_widget/stream_message_text_test.dart`:
- Around line 71-84: Add a web-only widget test for StreamMessageText that
disables BrowserContextMenu, rebuilds and verifies the SelectionArea key is
ValueKey(false), then enables it, rebuilds, and verifies ValueKey(true); restore
the original browser context-menu state in teardown, while keeping the existing
macOS test unchanged.
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📒 Files selected for processing (4)
packages/stream_chat_flutter/CHANGELOG.mdpackages/stream_chat_flutter/lib/src/context_menu/context_menu_region.dartpackages/stream_chat_flutter/lib/src/message_widget/components/stream_message_text.dartpackages/stream_chat_flutter/test/src/message_widget/stream_message_text_test.dart
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Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## master #2909 +/- ##
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- Coverage 74.01% 73.98% -0.03%
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Files 435 435
Lines 28160 28174 +14
==========================================
+ Hits 20843 20845 +2
- Misses 7317 7329 +12 ☔ View full report in Codecov by Harness. 🚀 New features to boost your workflow:
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| return SelectionArea( | ||
| // Rebuilding a live selection area after the browser context menu | ||
| // toggles throws on web; the key replaces it instead. | ||
| // TODO: Remove once the minimum Flutter has flutter/flutter#186459. |
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We should (probably with AI) make a separate file with all TODO's that depend on a flutter version, so we can quickly fix all todo's when we update a flutter version.
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Good idea, and I've taken the first step — though I'd suggest a tag rather than a file.
Surveying first: of 17 TODOs across all packages' lib/, exactly one is Flutter-version-dependent (this one). The rest are blocked on the backend, on our own refactors, or on unrelated features. So a file would have a single row today.
My worry with a file is drift — it duplicates state that already lives in the code, so it goes stale the first time someone adds a TODO and forgets to update it. And a stale registry is worse than none here, because a version bump would trust it. STYLE_GUIDE.md takes a position on exactly this under Avoid duplicating state: "keep only one source of truth, and don't replicate live state."
The repo already has the mechanism, too. From STYLE_GUIDE.md:
If the TODO groups a workstream, an optional short tag is fine (
// TODO(perf-migration): …), but it's a category label, not a GitHub handle.
With a live precedent in stream_chat/lib/src/core/util/list_extensions.dart. So grep -rn 'TODO(flutter)' is the list, and it can't go stale.
Pushed f149bf643 adopting it here:
// TODO(flutter): Remove once the minimum Flutter has flutter/flutter#186459.The part that actually delivers your goal is wiring the sweep into the bump itself — .claude/skills/flutter-version-bump/SKILL.md doesn't mention TODOs at all today, so I've filed FLU-725 to add that step plus a line in the style guide. Happy to switch to a real file instead if you'd rather; just say so and I'll do it in that ticket.
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Built it — #2915. You were right that a file is the better home; it holds context that doesn't fit in a code comment, and appending a row is lower friction than what I was proposing.
Three pieces, since a file nobody is obliged to read wouldn't help:
FLUTTER_BLOCKED.md— scan table plus a detail section per entry: symptom without the workaround, cause, upstream issue and fix PR, the release that unblocks it, how to confirm that release actually carries the fix, and what must not be deleted alongside it.STYLE_GUIDE.md— pairs every row with a// TODO(flutter):tag at the code site, sogrepstill finds every site if the file drifts.flutter-version-bumpskill — a sweep step in the Track B floor raise, which didn't mention TODOs at all before. That's the bit that delivers your goal: every stable triggers a floor raise under latest−1, so it's a guaranteed moment when the registry gets read.
Merge after this PR — the registry's only entry documents the workaround and tag that land here.
Adopts the existing `TODO(<category>)` convention (see `TODO(perf-migration)` in stream_chat) so `grep -rn 'TODO(flutter)'` enumerates every TODO waiting on a Flutter release, without a separate file duplicating what already lives in the code. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
68 lines and 559 words for one entry, most of it restating the cause and history already in FLU-710, PR #2909, and the code comment. Now 19 lines: fixed labelled fields per entry, so a human scans the bold labels and an agent can match them, with the H2 headings acting as the index instead of a table that duplicated every field below it. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Linear: FLU-712
Github Issue: #2906
CLA
Description of the pull request
Fixes #2906 —
Assertion failed: _selectable == nullon web, thrown fromSelectableRegionwhen the attachment button is tapped in a channel.Cause
SelectableRegion.buildconditionally wraps its subtree inPlatformSelectableRegionContextMenubased onkIsWeb && BrowserContextMenu.enabled && <desktop target>. Flipping that setting while aSelectionAreais mounted re-inflates the innerSelectionContainerbefore the old one unregisters, tripping the assert.ContextMenuRegionflipped that process-wide setting frominitState/dispose, and it mounts once per message on desktop/web. So opening a channel toggled the flag underneath every message'sSelectionArea, and the next rebuild — tapping the attachment button, in the report — crashed.This is flutter/flutter#186459, fixed upstream by #186553 (merged 2026-08-07).
git tag --contains 2a469b8is empty, so it is in neither 3.47.0 nor 3.47.1 and lands in 3.48. Our published floor is>=3.44.0, so every supported Flutter version is affected.The regression arrived in stable 3.41.0 via #176855, which changed that wrapper condition from the compile-time constant
kIsWebto the runtime-mutable_webContextMenuEnabled. Before that, the subtree shape could never change and the toggle was harmless.Changes
1. Key the selection area on the setting (
stream_message_text.dart) so a flip replaces the region — fresh state, nothing registered — instead of restructuring a live one.This is safe rather than lucky:
selectable_region.dartcontains nosetState, and its only inherited dependency (MediaQuery.orientationOf) sits after an earlyreturnfor desktop target platforms. On exactly the platforms where the crash fires,SelectableRegionState.buildcan only re-run from a parent rebuild — which is when the key regenerates. Replacement is also clean:_InactiveElements._unmountis depth-first, so the old_SelectionContainerState.dispose→registrar.removeruns while the registrar still holds the matching_selectable.2. Reference-count the suppression (
context_menu_region.dart) — two SDK-side bugs, independent of the framework regression:enableContextMenu()while dozens were still mounted, so the browser's native menu started appearing over ours. It churned more than it looks:stream_message_item.dartreturns early forisOutgoing/isDeleted/empty-menu, and message tiles are not keep-alive clients, so the flag flipped every time a message scrolled out of view or was deleted.release()also re-enabled the menu unconditionally, overriding a host app that had deliberately disabled it. It now captures the prior state and restores only what it changed — which also means such apps never see a flip, and so cannot hit the crash at all.Scope
StreamMessageTextis the onlySelectableRegionin the SDK — verified across this repo andstream_core_flutter.streaming_message_view.dart:81passesselectable: truedown toflutter_markdown, which usesSelectableText.rich(EditableText), a different mechanism that is unaffected.Mobile web is untouched:
PlatformWidgetBasedispatches ondefaultTargetPlatform, so mobile web takes themobilebranch, noContextMenuRegionmounts, and the flag never flips there.How this was tested
null).stream_chat_fluttersuite. Twostream_message_deletedgoldens fail on a local run, but they fail identically with the change stashed — pre-existing host drift on Flutter 3.47.0, and CI confirms it.dart analyze --fatal-infosanddart formatclean.Test coverage is limited by the harness, deliberately.
CurrentPlatform.isWebis false on the VM andBrowserContextMenu.disableContextMenu()assertskIsWebbefore touching the method channel, so the flag cannot be flipped in a VM test. Consequences:codecov/patchcheck is reporting.key:being removed and catches keying on the wrong global, but a hardcodedkey: const ValueKey(true)— which defeats the fix entirely — passes it. Off-web every reachable value ofBrowserContextMenu.enabledistrue, so no VM assertion can tell "derived" from "constant".A browser test that does catch all three mutations exists and is verified locally, following flutter/flutter#186553's own regression test (
@TestOn('browser'), a mockedSystemChannels.contextMenu, and aTargetPlatformVariantexcluding android/iOS). It needs a--platform chromelane, which this package does not have —test/flutter_test_config.dartpulls inalchemist, which does not compile for web. That is tracked separately in FLU-713 rather than bundled into this fix.Known limitations
SelectionAreais still exposed. The flag still flips, now once per channel enter/exit instead of per message mount/unmount. Not fixable from inside the SDK short of never restoring the browser menu.Screenshots / Videos
Not applicable — no visual change. This fixes a debug-mode assertion that red-screens the message text; the failure is a stack trace rather than a rendering difference. The reporter's video and full trace are in #2906.
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