Ensure constant bubble sizes for visual media.

Signal/src/ViewControllers/ConversationView/Cells/OWSMessageBubbleView.m

@@ -1027,8 +1027,7 @@ const UIDataDetectorTypes kOWSAllowedDataDetectorTypes
             if (self.viewItem.mediaAlbumItems.count == 1) {
                 // Honor the content aspect ratio for single media.
                 ConversationMediaAlbumItem *mediaAlbumItem = self.viewItem.mediaAlbumItems.firstObject;
-                if (mediaAlbumItem.attachmentStream && mediaAlbumItem.mediaSize.width > 0
+                if (mediaAlbumItem.mediaSize.width > 0 && mediaAlbumItem.mediaSize.height > 0) {
-                    && mediaAlbumItem.mediaSize.height > 0) {
                     CGSize mediaSize = mediaAlbumItem.mediaSize;
                     CGFloat contentAspectRatio = mediaSize.width / mediaSize.height;
                     // Clamp the aspect ratio so that very thin/wide content is presented

Signal/src/ViewControllers/ConversationView/ConversationViewItem.m

@@ -704,10 +704,15 @@ NSString *NSStringForOWSMessageCellType(OWSMessageCellType cellType)
                 : nil);
 
         if (![attachment isKindOfClass:[TSAttachmentStream class]]) {
+            TSAttachmentPointer *attachmentPointer = (TSAttachmentPointer *)attachment;
+            CGSize mediaSize = CGSizeZero;
+            if (attachmentPointer.mediaSize.width > 0 && attachmentPointer.mediaSize.height > 0) {
+                mediaSize = attachmentPointer.mediaSize;
+            }
             [mediaAlbumItems addObject:[[ConversationMediaAlbumItem alloc] initWithAttachment:attachment
                                                                              attachmentStream:nil
                                                                                       caption:caption
-                                                                                    mediaSize:CGSizeZero]];
+                                                                                    mediaSize:mediaSize]];
             continue;
         }
         TSAttachmentStream *attachmentStream = (TSAttachmentStream *)attachment;