Updated to working spinner

...but still pulling static profile pic from Google instead of
using asset images

.metadata

@@ -18,6 +18,9 @@ migration:
     - platform: android
       create_revision: daa2ecf16534b286b7365d5c84554516b89cfd80
       base_revision: daa2ecf16534b286b7365d5c84554516b89cfd80
+    - platform: macos
+      create_revision: daa2ecf16534b286b7365d5c84554516b89cfd80
+      base_revision: daa2ecf16534b286b7365d5c84554516b89cfd80
 
   # User provided section
 

lib/main.dart

@@ -2,8 +2,6 @@ import 'package:flutter/material.dart';
 import 'package:photos/src/model/app.dart';
 import 'package:scoped_model/scoped_model.dart';
 
-import 'src/model/photo_cards.dart';
-import 'src/model/photo_producer.dart';
 import 'src/model/photos_library_api_model.dart';
 import 'src/pages/home_page.dart';
 
@@ -24,10 +22,6 @@ Future<void> run({required bool interactive}) async {
         model: apiModel,
         child: HomePage(
           interactive: interactive,
-          montageBuilder: () => PhotoMontage(),
-          producerBuilder: (PhotosLibraryApiModel model, PhotoMontage montage) {
-            return PhotoCardProducer(model, montage);
-          },
         ),
       ),
     ),

lib/src/model/photo.dart

@@ -14,10 +14,15 @@ class Photo {
 
   /// The Google Photos API representation of this photo.
   ///
+  /// This will only be set for photos that are backed by Google Photos.
+  /// Sometimes, the app will create photos from assets that are statically
+  /// bundled with the app (e.g. in the case of network errors), and for these
+  /// photos, this field will be null.
+  ///
   /// See also:
   ///
   ///  * <https://developers.google.com/photos/library/reference/rest/v1/mediaItems#MediaItem>
-  final MediaItem mediaItem;
+  final MediaItem? mediaItem;
 
   /// The size in logical pixels of the photo.
   ///
@@ -46,14 +51,14 @@ class Photo {
   final Uint8List bytes;
 
   @override
-  int get hashCode => Object.hash(mediaItem.id, size);
+  int get hashCode => Object.hash(mediaItem?.id, size);
 
   @override
   bool operator ==(dynamic other) {
     if (runtimeType != other.runtimeType) {
       return false;
     }
     Photo typedOther = other;
-    return mediaItem.id == typedOther.mediaItem.id && size == typedOther.size;
+    return mediaItem?.id == typedOther.mediaItem?.id && size == typedOther.size;
   }
 }