[CP] Fix Snackbar TalkBack regression (#116417)

* Add M2 defaults and template skeleton

* add MaterialStateColor functionality to ActionTextColor (issue #110402)

* Add M2 defaults and template skeleton

* updated material 3 tokens

* Updated snackbar demo

* add theme tests

* add gen defaults

* formatting

* more whitespace fixes

* add widget type

* update docs

* code review changes

* Add line overflow functionality

* whitespace fixes

* update M3 animation

* whitespace fixes

* add insetPadding param

* Modifed icon parameter to showCloseIcon

* white space fixes

* test fixes

* rename iconColor to closeIconColor

* debug test fix

* de-britishification

* g3fix

* g3fix

* debug test fix

* Fix Snackbar talkback regression

* fix merge weirdness

* test fix

* fix linux analysis error

* fix linux analysis error

* fix linux analysis error

* fix linux analysis error

* fix linux analysis error

* fix linux analysis error

packages/flutter/lib/src/material/snack_bar.dart

@@ -628,9 +628,7 @@ class _SnackBarState extends State<SnackBar> {
 
     Widget snackBar = Padding(
       padding: padding,
-      child: SingleChildScrollView(
-        child: Column(
-          mainAxisSize: MainAxisSize.min,
+        child: Wrap(
           children: <Widget>[
             Row(
               children: <Widget>[
@@ -656,7 +654,7 @@ class _SnackBarState extends State<SnackBar> {
               children: maybeActionAndIcon),
             ),
           ],
-        ),
+
       ),
     );
 

packages/flutter/test/material/debug_test.dart

@@ -316,24 +316,7 @@ void main() {
       '     TextButtonTheme\n'
       '     Padding\n'
       '     Row\n'
-      '     Column\n'
-      '     _SingleChildViewport\n'
-      '     IgnorePointer-[GlobalKey#d48e8]\n'
-      '     Semantics\n'
-      '     Listener\n'
-      '     _GestureSemantics\n'
-      '     RawGestureDetector-[LabeledGlobalKey<RawGestureDetectorState>#0c3e0]\n'
-      '     Listener\n'
-      '     _ScrollableScope\n'
-      '     _ScrollSemantics-[GlobalKey#349b8]\n'
-      '     NotificationListener<ScrollMetricsNotification>\n'
-      '     RepaintBoundary\n'
-      '     CustomPaint\n'
-      '     RepaintBoundary\n'
-      '     NotificationListener<ScrollNotification>\n'
-      '     GlowingOverscrollIndicator\n'
-      '     Scrollable\n'
-      '     SingleChildScrollView\n'
+      '     Wrap\n'
       '     Padding\n'
       '     MediaQuery\n'
       '     Padding\n'
@@ -395,7 +378,7 @@ void main() {
       '     Directionality\n'
       '     [root]\n'
       '   Typically, the ScaffoldMessenger widget is introduced by the\n'
-      '   MaterialApp at the top of your application widget tree.\n',
+      '   MaterialApp at the top of your application widget tree.\n'
     ));
   });
 }

packages/flutter/test/material/snack_bar_test.dart

@@ -1276,6 +1276,10 @@ void main() {
     await tester.pumpAndSettle();
 
     expect(tester.getSemantics(find.text('snack')), matchesSemantics(
+      isLiveRegion: true,
+      hasDismissAction: true,
+      hasScrollDownAction: true,
+      hasScrollUpAction: true,
       label: 'snack',
       textDirection: TextDirection.ltr,
     ));