[flutter] Fix grayscaling in dress-up example.

spine-flutter/example/lib/dress_up.dart

@@ -80,7 +80,15 @@ class DressUpState extends State<DressUp> {
                                 },
                                 child: _selectedSkins[skinName] == true
                                       ? box
-                                      : ColorFiltered(colorFilter: const ColorFilter.mode(Colors.grey, painting.BlendMode.saturation,), child: box)
+                                      // Does not work on web.
+                                      //: ColorFiltered(colorFilter: const ColorFilter.mode(Colors.grey, painting.BlendMode.saturation,), child: box)
+                                      : Container(
+                                          foregroundDecoration: BoxDecoration(
+                                            color: Colors.grey,
+                                            backgroundBlendMode: painting.BlendMode.saturation,
+                                          ),
+                                          child: box
+                                        )
                             );
                           }).toList()
                       ),

spine-flutter/example/pubspec.lock

@@ -5,35 +5,40 @@ packages:
     dependency: transitive
     description:
       name: async
-      url: "https://pub.dartlang.org"
+      sha256: bfe67ef28df125b7dddcea62755991f807aa39a2492a23e1550161692950bbe0
+      url: "https://pub.dev"
     source: hosted
-    version: "2.9.0"
+    version: "2.10.0"
   characters:
     dependency: transitive
     description:
       name: characters
-      url: "https://pub.dartlang.org"
+      sha256: e6a326c8af69605aec75ed6c187d06b349707a27fbff8222ca9cc2cff167975c
+      url: "https://pub.dev"
     source: hosted
     version: "1.2.1"
   collection:
     dependency: transitive
     description:
       name: collection
-      url: "https://pub.dartlang.org"
+      sha256: cfc915e6923fe5ce6e153b0723c753045de46de1b4d63771530504004a45fae0
+      url: "https://pub.dev"
     source: hosted
-    version: "1.16.0"
+    version: "1.17.0"
   crypto:
     dependency: transitive
     description:
       name: crypto
-      url: "https://pub.dartlang.org"
+      sha256: aa274aa7774f8964e4f4f38cc994db7b6158dd36e9187aaceaddc994b35c6c67
+      url: "https://pub.dev"
     source: hosted
     version: "3.0.2"
   cupertino_icons:
     dependency: "direct main"
     description:
       name: cupertino_icons
-      url: "https://pub.dartlang.org"
+      sha256: e35129dc44c9118cee2a5603506d823bab99c68393879edb440e0090d07586be
+      url: "https://pub.dev"
     source: hosted
     version: "1.0.5"
   esotericsoftware_spine_flutter:
@@ -47,14 +52,16 @@ packages:
     dependency: transitive
     description:
       name: ffi
-      url: "https://pub.dartlang.org"
+      sha256: a38574032c5f1dd06c4aee541789906c12ccaab8ba01446e800d9c5b79c4a978
+      url: "https://pub.dev"
     source: hosted
     version: "2.0.1"
   flame:
     dependency: "direct main"
     description:
       name: flame
-      url: "https://pub.dartlang.org"
+      sha256: "7a7db4875d8285234e46fb66920ba31cc53fd61d207340bfd886c43122a4ae06"
+      url: "https://pub.dev"
     source: hosted
     version: "1.4.0"
   flutter:
@@ -66,77 +73,88 @@ packages:
     dependency: "direct dev"
     description:
       name: flutter_lints
-      url: "https://pub.dartlang.org"
+      sha256: aeb0b80a8b3709709c9cc496cdc027c5b3216796bc0af0ce1007eaf24464fd4c
+      url: "https://pub.dev"
     source: hosted
     version: "2.0.1"
   http:
     dependency: transitive
     description:
       name: http
-      url: "https://pub.dartlang.org"
+      sha256: "6aa2946395183537c8b880962d935877325d6a09a2867c3970c05c0fed6ac482"
+      url: "https://pub.dev"
     source: hosted
     version: "0.13.5"
   http_parser:
     dependency: transitive
     description:
       name: http_parser
-      url: "https://pub.dartlang.org"
+      sha256: "2aa08ce0341cc9b354a498388e30986515406668dbcc4f7c950c3e715496693b"
+      url: "https://pub.dev"
     source: hosted
-    version: "4.0.1"
+    version: "4.0.2"
   inject_js:
     dependency: transitive
     description:
       name: inject_js
-      url: "https://pub.dartlang.org"
+      sha256: "3ab213e2c76375a611f57eb0044d32c6e18c5091d52510e7fe9f88f6bee83d19"
+      url: "https://pub.dev"
     source: hosted
     version: "2.0.0"
   js:
     dependency: transitive
     description:
       name: js
-      url: "https://pub.dartlang.org"
+      sha256: "5528c2f391ededb7775ec1daa69e65a2d61276f7552de2b5f7b8d34ee9fd4ab7"
+      url: "https://pub.dev"
     source: hosted
     version: "0.6.5"
   lints:
     dependency: transitive
     description:
       name: lints
-      url: "https://pub.dartlang.org"
+      sha256: "5e4a9cd06d447758280a8ac2405101e0e2094d2a1dbdd3756aec3fe7775ba593"
+      url: "https://pub.dev"
     source: hosted
-    version: "2.0.0"
+    version: "2.0.1"
   material_color_utilities:
     dependency: transitive
     description:
       name: material_color_utilities
-      url: "https://pub.dartlang.org"
+      sha256: d92141dc6fe1dad30722f9aa826c7fbc896d021d792f80678280601aff8cf724
+      url: "https://pub.dev"
     source: hosted
-    version: "0.1.5"
+    version: "0.2.0"
   meta:
     dependency: transitive
     description:
       name: meta
-      url: "https://pub.dartlang.org"
+      sha256: "6c268b42ed578a53088d834796959e4a1814b5e9e164f147f580a386e5decf42"
+      url: "https://pub.dev"
     source: hosted
     version: "1.8.0"
   ordered_set:
     dependency: transitive
     description:
       name: ordered_set
-      url: "https://pub.dartlang.org"
+      sha256: "74b0454418f58c34c8e527d91fb1ef571297dbcd5d3b4e5f983dc884e39cdf85"
+      url: "https://pub.dev"
     source: hosted
     version: "5.0.0"
   path:
     dependency: transitive
     description:
       name: path
-      url: "https://pub.dartlang.org"
+      sha256: db9d4f58c908a4ba5953fcee2ae317c94889433e5024c27ce74a37f94267945b
+      url: "https://pub.dev"
     source: hosted
     version: "1.8.2"
   raw_image_provider:
     dependency: transitive
     description:
       name: raw_image_provider
-      url: "https://pub.dartlang.org"
+      sha256: d5b20d69e8a998a4dc846a3d35dca8760121d18b6895233fca52f9055a9a7e8e
+      url: "https://pub.dev"
     source: hosted
     version: "0.2.0"
   sky_engine:
@@ -148,44 +166,50 @@ packages:
     dependency: transitive
     description:
       name: source_span
-      url: "https://pub.dartlang.org"
+      sha256: dd904f795d4b4f3b870833847c461801f6750a9fa8e61ea5ac53f9422b31f250
+      url: "https://pub.dev"
     source: hosted
-    version: "1.9.0"
+    version: "1.9.1"
   string_scanner:
     dependency: transitive
     description:
       name: string_scanner
-      url: "https://pub.dartlang.org"
+      sha256: "556692adab6cfa87322a115640c11f13cb77b3f076ddcc5d6ae3c20242bedcde"
+      url: "https://pub.dev"
     source: hosted
-    version: "1.1.1"
+    version: "1.2.0"
   term_glyph:
     dependency: transitive
     description:
       name: term_glyph
-      url: "https://pub.dartlang.org"
+      sha256: a29248a84fbb7c79282b40b8c72a1209db169a2e0542bce341da992fe1bc7e84
+      url: "https://pub.dev"
     source: hosted
     version: "1.2.1"
   typed_data:
     dependency: transitive
     description:
       name: typed_data
-      url: "https://pub.dartlang.org"
+      sha256: "26f87ade979c47a150c9eaab93ccd2bebe70a27dc0b4b29517f2904f04eb11a5"
+      url: "https://pub.dev"
     source: hosted
     version: "1.3.1"
   vector_math:
     dependency: transitive
     description:
       name: vector_math
-      url: "https://pub.dartlang.org"
+      sha256: "80b3257d1492ce4d091729e3a67a60407d227c27241d6927be0130c98e741803"
+      url: "https://pub.dev"
     source: hosted
-    version: "2.1.2"
+    version: "2.1.4"
   web_ffi_fork:
     dependency: transitive
     description:
       name: web_ffi_fork
-      url: "https://pub.dartlang.org"
+      sha256: "7466228b7fc6a29ee1b5f6ab7ee2473847367a70fb523eb1a7c1d7a6a9841589"
+      url: "https://pub.dev"
     source: hosted
     version: "0.7.4"
 sdks:
-  dart: ">=2.17.6 <3.0.0"
+  dart: ">=2.18.0 <4.0.0"
   flutter: ">=3.3.0"