Simplify Chip slightly (#47254)

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

@@ -1851,10 +1851,7 @@ class _RawChipState extends State<RawChip> with TickerProviderStateMixin<RawChip
           animation: Listenable.merge(<Listenable>[selectController, enableController]),
           builder: (BuildContext context, Widget child) {
             return Container(
-              decoration: ShapeDecoration(
-                shape: shape,
-                color: getBackgroundColor(chipTheme),
-              ),
+              color: getBackgroundColor(chipTheme),
               child: child,
             );
           },

packages/flutter/test/material/chip_test.dart

@@ -178,13 +178,7 @@ Future<void> _pumpCheckmarkChip(
 void _expectCheckmarkColor(Finder finder, Color color) {
   expect(
     finder,
-    paints
-      // The first path that is painted is the selection overlay. We do not care
-      // how it is painted but it has to be added it to this pattern so that the
-      // check mark can be checked next.
-      ..path()
-      // The second path that is painted is the check mark.
-      ..path(color: color),
+    paints..path(color: color)
   );
 }
 
@@ -1435,7 +1429,7 @@ void main() {
       ),
     );
 
-    expect(materialBox, paints..path(color: chipTheme.disabledColor));
+    expect(materialBox, paints..rect(color: chipTheme.disabledColor));
   });
 
   testWidgets('Chip size is configurable by ThemeData.materialTapTargetSize', (WidgetTester tester) async {
@@ -1535,13 +1529,13 @@ void main() {
     DefaultTextStyle labelStyle = getLabelStyle(tester);
 
     // Check default theme for enabled widget.
-    expect(materialBox, paints..path(color: defaultChipTheme.backgroundColor));
+    expect(materialBox, paints..rect(color: defaultChipTheme.backgroundColor));
     expect(iconData.color, equals(const Color(0xde000000)));
     expect(labelStyle.style.color, equals(Colors.black.withAlpha(0xde)));
     await tester.tap(find.byType(RawChip));
     await tester.pumpAndSettle();
     materialBox = getMaterialBox(tester);
-    expect(materialBox, paints..path(color: defaultChipTheme.selectedColor));
+    expect(materialBox, paints..rect(color: defaultChipTheme.selectedColor));
     await tester.tap(find.byType(RawChip));
     await tester.pumpAndSettle();
 
@@ -1550,7 +1544,7 @@ void main() {
     await tester.pumpAndSettle();
     materialBox = getMaterialBox(tester);
     labelStyle = getLabelStyle(tester);
-    expect(materialBox, paints..path(color: defaultChipTheme.disabledColor));
+    expect(materialBox, paints..rect(color: defaultChipTheme.disabledColor));
     expect(labelStyle.style.color, equals(Colors.black.withAlpha(0xde)));
 
     // Apply a custom theme.
@@ -1572,13 +1566,13 @@ void main() {
     labelStyle = getLabelStyle(tester);
 
     // Check custom theme for enabled widget.
-    expect(materialBox, paints..path(color: customTheme.backgroundColor));
+    expect(materialBox, paints..rect(color: customTheme.backgroundColor));
     expect(iconData.color, equals(customTheme.deleteIconColor));
     expect(labelStyle.style.color, equals(Colors.black.withAlpha(0xde)));
     await tester.tap(find.byType(RawChip));
     await tester.pumpAndSettle();
     materialBox = getMaterialBox(tester);
-    expect(materialBox, paints..path(color: customTheme.selectedColor));
+    expect(materialBox, paints..rect(color: customTheme.selectedColor));
     await tester.tap(find.byType(RawChip));
     await tester.pumpAndSettle();
 
@@ -1592,7 +1586,7 @@ void main() {
     await tester.pumpAndSettle();
     materialBox = getMaterialBox(tester);
     labelStyle = getLabelStyle(tester);
-    expect(materialBox, paints..path(color: customTheme.disabledColor));
+    expect(materialBox, paints..rect(color: customTheme.disabledColor));
     expect(labelStyle.style.color, equals(Colors.black.withAlpha(0xde)));
   });
 

packages/flutter/test/material/chip_theme_test.dart

@@ -107,7 +107,7 @@ void main() {
 
     final RenderBox materialBox = getMaterialBox(tester);
 
-    expect(materialBox, paints..path(color: chipTheme.backgroundColor));
+    expect(materialBox, paints..rect(color: chipTheme.backgroundColor));
   });
 
   testWidgets('Chip overrides ThemeData theme if ChipTheme present', (WidgetTester tester) async {
@@ -161,7 +161,7 @@ void main() {
     final RenderBox materialBox = getMaterialBox(tester);
     final Material material = getMaterial(tester);
 
-    expect(materialBox, paints..path(color: Color(customTheme.backgroundColor.value)));
+    expect(materialBox, paints..rect(color: Color(customTheme.backgroundColor.value)));
     expect(material.elevation, customTheme.elevation);
     expect(material.shadowColor, customTheme.shadowColor);
   }, skip: isBrowser);