Fix image proxy thumbnails not retrieving image dimensions properly (#…

…1522)

fix: thumbnails being proxied now retrieve dimensions correctly

lib/post/utils/post.dart

@@ -325,6 +325,13 @@ Future<PostViewMedia> parsePostView(PostView postView, bool fetchImageDimensions
   String? thumbnailUrl = postView.post.thumbnailUrl;
   String? videoUrl = postView.post.embedVideoUrl;
 
+  // Handle thumbnail urls that are proxied via /image_proxy
+  Uri? thumbnailUri = Uri.tryParse(thumbnailUrl ?? '');
+
+  if (thumbnailUri?.path == '/api/v3/image_proxy') {
+    thumbnailUrl = thumbnailUri?.queryParameters['url'];
+  }
+
   // First, check what type of link we're dealing with based on the url (MediaType.image, MediaType.video, MediaType.link, MediaType.text)
   bool isImage = isImageUrl(url);
   bool isVideo = isVideoUrl(videoUrl ?? url);