feat(linux/notify): support avarar icon

support avarar icon

lib/widgets/local_notifications_extension.dart

@@ -5,6 +5,7 @@ import 'package:flutter/material.dart';
 
 import 'package:collection/collection.dart';
 import 'package:desktop_notifications/desktop_notifications.dart';
+import 'package:image/image.dart';
 import 'package:matrix/matrix.dart';
 import 'package:universal_html/html.dart' as html;
 
@@ -13,6 +14,7 @@ import 'package:fluffychat/l10n/l10n.dart';
 import 'package:fluffychat/utils/client_download_content_extension.dart';
 import 'package:fluffychat/utils/matrix_sdk_extensions/matrix_locals.dart';
 import 'package:fluffychat/utils/platform_infos.dart';
+import 'package:fluffychat/utils/push_helper.dart';
 import 'package:fluffychat/widgets/fluffy_chat_app.dart';
 import 'package:fluffychat/widgets/matrix.dart';
 
@@ -77,6 +79,35 @@ extension LocalNotificationsExtension on MatrixState {
         tag: event.room.id,
       );
     } else if (Platform.isLinux) {
+      final avatarUrl = event.room.avatar;
+      final hints = [NotificationHint.soundName('message-new-instant')];
+
+      if (avatarUrl != null) {
+        const size = notificationAvatarDimension;
+        const thumbnailMethod = ThumbnailMethod.crop;
+        // Pre-cache so that we can later just set the thumbnail uri as icon:
+        final data = await client.downloadMxcCached(
+          avatarUrl,
+          width: size,
+          height: size,
+          thumbnailMethod: thumbnailMethod,
+          isThumbnail: true,
+        );
+
+        final image = decodeImage(data);
+        if (image != null) {
+          final realData = image.getBytes(order: ChannelOrder.rgba);
+          hints.add(
+            NotificationHint.imageData(
+              image.width,
+              image.height,
+              realData,
+              hasAlpha: true,
+              channels: 4,
+            ),
+          );
+        }
+      }
       final notification = await linuxNotifications!.notify(
         title,
         body: body,
@@ -93,9 +124,7 @@ extension LocalNotificationsExtension on MatrixState {
             L10n.of(context).markAsRead,
           ),
         ],
-        hints: [
-          NotificationHint.soundName('message-new-instant'),
-        ],
+        hints: hints,
       );
       notification.action.then((actionStr) {
         var action = DesktopNotificationActions.values