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fix(ui): on a phone, a snack bar stands above the screen's floating button

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Below medium windows the frame's scaffold showed the screens' snack bars,
under the floating button of the screen's own scaffold, so a tap on a
snack bar's Undo hit the button instead (found 9 Nov 2026, Todo's Undo
after deleting the completed tasks). The screens get a messenger of their
own there, and their scaffolds lift the snack bars above their buttons, as
Material places them. From medium windows on the frame's scaffold still
shows them, once: a messenger shows a snack bar on each of its scaffolds
not inside another, as two panes side by side are. As the window grows
past a phone's, the phone's snack bars go, since a scaffold whose
messenger changes keeps the one it showed for good.

Whats-New: On a phone, a message's Undo is no longer hidden under the + button.
Whats-New-De: Auf dem Handy liegt das Rückgängig einer Meldung nicht mehr unter der +-Schaltfläche.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>
This commit is contained in:
Tizian 「ティツィアーン」 2026-11-09 23:12:29 +01:00
commit 560de2ed93
Signed by: raisondetredev
GPG key ID: 07F6FCF405488B64
1 changed files with 134 additions and 5 deletions
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12
apps/learn/halkyon_learn_flutter/test/core/router/app_shell_test.dart
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@ -147,8 +147,9 @@ void main() {
expect(fadesInto(), scheme.surfaceContainerLow);
});
testWidgets('a snack bar floats 8 above the navigation bar and its fade, '
'16 in from the sides; from medium windows on 560 wide, centred', (
testWidgets("a snack bar floats above the screen's floating button, "
'clear of the navigation bar and its fade, 16 in from the sides; from '
'medium windows on 560 wide, centred', (
tester,
) async {
tester.view.padding = const FakeViewPadding(bottom: 24);
@ -171,12 +172,15 @@ void main() {
await showApp(tester, width: 400);
final narrow = await snackBar();
final button = tester.getRect(find.byType(FloatingActionButton));
expect(narrow.left, 16);
expect(narrow.right, 400 - 16);
// The fade's top, less 8.
// Above the Library's floating button, which would otherwise cover its
// action (found 9 Nov 2026), and so above the fade's top, less 8.
expect(narrow.bottom, lessThanOrEqualTo(button.top));
expect(
narrow.bottom,
900 - 24 - 64 - FlushNavigationBar.fadeHeight - 8,
lessThan(900 - 24 - 64 - FlushNavigationBar.fadeHeight - 8),
);
await showApp(tester);