Add back message list watching, support attachments without metadata

src/transcript/transcript-drawing-area.vala

@@ -110,11 +110,13 @@ private class TranscriptDrawingArea : Widget
 
             // Check for attachments. For each one, add an image layout bubble
             foreach (var attachment in message.attachments) {
+                Graphene.Size? image_size = null;
                 if (attachment.metadata != null) {
-                    var image_size = Graphene.Size() {
+                    image_size = Graphene.Size() {
                         width = attachment.metadata.attribution_info.width,
                         height = attachment.metadata.attribution_info.height
                     };
+                }
 
                 var image_layout = new ImageBubbleLayout(attachment.preview_path, message.from_me, this, max_width, image_size);
                 image_layout.is_downloaded = attachment.preview_downloaded;
@@ -130,7 +132,6 @@ private class TranscriptDrawingArea : Widget
                     }
                 }
             }
-            }
 
             last_sender = message.sender;
             last_date = date;

src/transcript/transcript-view.vala

@@ -26,6 +26,7 @@ public class TranscriptView : Adw.Bin
                 });
 
                 value.load_messages();
+                value.watch_updates();
             } else {
                 transcript_drawing_area.set_messages(new ArrayList<Message>());
             }