ImageProvider.toString uses double.toStringAsFixed (#131348)

This provides consistency for web vs VM (and is more consistent with how we do doubles everywhere else in toStrings).

Author: Hixie

packages/flutter/lib/src/painting/_network_image_io.dart

@@ -185,5 +185,5 @@ class NetworkImage extends image_provider.ImageProvider<image_provider.NetworkIm
   int get hashCode => Object.hash(url, scale);
 
   @override
-  String toString() => '${objectRuntimeType(this, 'NetworkImage')}("$url", scale: $scale)';
+  String toString() => '${objectRuntimeType(this, 'NetworkImage')}("$url", scale: ${scale.toStringAsFixed(1)})';
 }

packages/flutter/lib/src/painting/_network_image_web.dart

@@ -215,6 +215,5 @@ class NetworkImage
   int get hashCode => Object.hash(url, scale);
 
   @override
-  String toString() =>
-      '${objectRuntimeType(this, 'NetworkImage')}("$url", scale: $scale)';
+  String toString() => '${objectRuntimeType(this, 'NetworkImage')}("$url", scale: ${scale.toStringAsFixed(1)})';
 }

packages/flutter/lib/src/painting/image_provider.dart

@@ -1618,7 +1618,7 @@ class FileImage extends ImageProvider<FileImage> {
   int get hashCode => Object.hash(file.path, scale);
 
   @override
-  String toString() => '${objectRuntimeType(this, 'FileImage')}("${file.path}", scale: $scale)';
+  String toString() => '${objectRuntimeType(this, 'FileImage')}("${file.path}", scale: ${scale.toStringAsFixed(1)})';
 }
 
 /// Decodes the given [Uint8List] buffer as an image, associating it with the
@@ -1722,7 +1722,7 @@ class MemoryImage extends ImageProvider<MemoryImage> {
   int get hashCode => Object.hash(bytes.hashCode, scale);
 
   @override
-  String toString() => '${objectRuntimeType(this, 'MemoryImage')}(${describeIdentity(bytes)}, scale: $scale)';
+  String toString() => '${objectRuntimeType(this, 'MemoryImage')}(${describeIdentity(bytes)}, scale: ${scale.toStringAsFixed(1)})';
 }
 
 /// Fetches an image from an [AssetBundle], associating it with the given scale.
@@ -1863,7 +1863,7 @@ class ExactAssetImage extends AssetBundleImageProvider {
   int get hashCode => Object.hash(keyName, scale, bundle);
 
   @override
-  String toString() => '${objectRuntimeType(this, 'ExactAssetImage')}(name: "$keyName", scale: $scale, bundle: $bundle)';
+  String toString() => '${objectRuntimeType(this, 'ExactAssetImage')}(name: "$keyName", scale: ${scale.toStringAsFixed(1)}, bundle: $bundle)';
 }
 
 // A completer used when resolving an image fails sync.

packages/flutter/test/painting/image_provider_test.dart

@@ -159,6 +159,12 @@ void main() {
     expect(imageCache.statusForKey(provider).untracked, false);
     expect(imageCache.pendingImageCount, 1);
   }, skip: kIsWeb); // [intended] The web cannot load files.
+
+  test('ImageProvider toStrings', () async {
+    expect(const NetworkImage('test', scale: 1.21).toString(), 'NetworkImage("test", scale: 1.2)');
+    expect(const ExactAssetImage('test', scale: 1.21).toString(), 'ExactAssetImage(name: "test", scale: 1.2, bundle: null)');
+    expect(MemoryImage(Uint8List(0), scale: 1.21).toString(), equalsIgnoringHashCodes('MemoryImage(Uint8List#00000, scale: 1.2)'));
+  });
 }
 
 class FakeCodec implements Codec {