Repository navigation
[material_ui] Fix DropdownButtonFormField underline alignment at bottom - #12606
Merged
auto-submit[bot] merged 15 commits intoOct 2, 2026
Merged
auto-submit[bot] merged 15 commits into
auto-submit[bot] merged 15 commits into
Conversation
github-actions
Bot
added
p: material_ui
triage-design
11 tasks done
![gemini-code-assist[bot]](https://avatars.githubusercontent.com/in/956858?s=60&v=4){kind=small}
Contributor
There was a problem hiding this comment.
Code Review
This pull request introduces an isVerticallyExpanded property to DropdownButton and DropdownButtonFormField to control whether the inner contents expand to fill the available vertical space. When this property is false, the widget is wrapped in an Align widget to prevent vertical stretching. The feedback suggests adding a test to verify this default behavior when isVerticallyExpanded is false.
| p2: Offset(width, containerHeight - 0.5), | ||
| ), | ||
| ); | ||
| }); |
Contributor
There was a problem hiding this comment.
It would be highly beneficial to also test the default behavior where isVerticallyExpanded is false. This ensures that the Align wrapper correctly prevents the DropdownButtonFormField from stretching to fill the parent's available height, preventing future regressions.
});
testWidgets('DropdownButtonFormField does not stretch vertically when isVerticallyExpanded is false', (
WidgetTester tester,
) async {
const containerHeight = 200.0;
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: SizedBox(
height: containerHeight,
child: DropdownButtonFormField<int>(
isExpanded: true,
isVerticallyExpanded: false,
items: const [DropdownMenuItem(value: 1, child: Text('Option 1'))],
onChanged: (_) {},
),
),
),
),
);
final Finder decorator = find.byType(InputDecorator);
final RenderBox box = tester.renderObject(decorator);
expect(box.size.height, lessThan(containerHeight));
});
QuncCccccc
approved these changes
Sep 22, 2026
elliette
self-requested a review
September 29, 2026 22:09
elliette
approved these changes
Sep 30, 2026
QuncCccccc
added
the
autosubmit
This was referenced Oct 5, 2026
ZhuJHua
pushed a commit
to ZhuJHua/flutter
that referenced
this pull request
Oct 6, 2026
…er#193840) flutter/packages@5620e65...951f2f7 2026-10-05 [email protected] [material_ui] Add scrollPadding property to DropdownMenuFormField (flutter/packages#12735) 2026-10-02 [email protected] [material_ui] Migrate M3 Motion template to use new gen_defaults (flutter/packages#13058) 2026-10-02 [email protected] [cupertino_ui] Forward showDragHandle from showCupertinoSheet to CupertinoSheetRoute (flutter/packages#13011) 2026-10-02 [email protected] [cupertino_ui] Fix CupertinoMagnifier focal point with custom size (flutter/packages#13029) 2026-10-02 [email protected] [ci] Add material_ui and cupertino_ui to customer testing (flutter/packages#13114) 2026-10-02 [email protected] [material_ui] Add Material 3 Expressive migration skill (flutter/packages#12818) 2026-10-02 [email protected] [video_player] Ignore late position updates after disposal (flutter/packages#12971) 2026-10-02 [email protected] [material_ui] Remove unconditional dart:io import from about.dart (flutter/packages#12774) 2026-10-02 [email protected] [material_ui] Fix DropdownButtonFormField underline alignment at bottom (flutter/packages#12606) 2026-10-02 [email protected] Roll Flutter from e89fd0a to d03768e (23 revisions) (flutter/packages#13111) 2026-10-02 [email protected] [material_ui] Migrate `Switch` API doc snippets to {@example} (batch 8) (flutter/packages#13052) 2026-10-02 [email protected] [url_launcher] Fix supportsCloseForLaunchMode to query close support (flutter/packages#12926) 2026-10-02 [email protected] Redistribute iOS/macOS Suggested Reviewers (flutter/packages#13076) 2026-10-02 [email protected] [image_picker] Subsample large images when resizing on Android (flutter/packages#13038) 2026-10-02 [email protected] [cupertino_ui] Remove redundant null arguments in Completer.complete (flutter/packages#13008) 2026-10-02 [email protected] [repo] Update AGENTS.md with dependency allowance and versioning guidance (flutter/packages#12579) If this roll has caused a breakage, revert this CL and set the roller to dry run mode using the controls here: https://autoroll.skia.org/r/flutter-packages-flutter-autoroll Please CC [email protected] on the revert to ensure that a human is aware of the problem. To file a bug in Flutter: 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
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
3 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
This PR fixes the visual issue where the underline of a
DropdownButtonFormFielddid not align at the bottom of its expanded container.Fixes flutter/flutter#162350
Port of flutter/flutter#181040.
Pre-Review Checklist
[shared_preferences]///).If you need help, consider asking for advice on the #hackers-new channel on Discord.
Note: The Flutter team is currently trialing the use of Gemini Code Assist for GitHub. Comments from the
gemini-code-assistbot should not be taken as authoritative feedback from the Flutter team. If you find its comments useful you can update your code accordingly, but if you are unsure or disagree with the feedback, please feel free to wait for a Flutter team member's review for guidance on which automated comments should be addressed.Footnotes
Regular contributors who have demonstrated familiarity with the repository guidelines only need to comment if the PR is not auto-exempted by repo tooling. ↩ ↩2