Show mentioned badges & enable scrolling to mentions in conversations

ts/models/conversations.ts

@@ -2056,6 +2056,7 @@ export class ConversationModel extends window.Backbone
         ? window.i18n('icu:noteToSelf')
         : this.getTitle(),
       unreadCount: this.get('unreadCount') || 0,
+      unreadMentionsCount: this.get('unreadMentionsCount'),
       ...(isDirectConversation(this.attributes)
         ? {
             type: 'direct' as const,
@@ -4913,17 +4914,28 @@ export class ConversationModel extends window.Backbone
   }
 
   async updateUnread(): Promise<void> {
-    const unreadCount = await window.Signal.Data.getTotalUnreadForConversation(
-      this.id,
-      {
-        storyId: undefined,
-        includeStoryReplies: !isGroup(this.attributes),
-      }
-    );
+    const options = {
+      storyId: undefined,
+      includeStoryReplies: !isGroup(this.attributes),
+    };
+    const [unreadCount, unreadMentionsCount] = await Promise.all([
+      window.Signal.Data.getTotalUnreadForConversation(this.id, options),
+      window.Signal.Data.getTotalUnreadMentionsOfMeForConversation(
+        this.id,
+        options
+      ),
+    ]);
 
     const prevUnreadCount = this.get('unreadCount');
-    if (prevUnreadCount !== unreadCount) {
-      this.set({ unreadCount });
+    const prevUnreadMentionsCount = this.get('unreadMentionsCount');
+    if (
+      prevUnreadCount !== unreadCount ||
+      prevUnreadMentionsCount !== unreadMentionsCount
+    ) {
+      this.set({
+        unreadCount,
+        unreadMentionsCount,
+      });
       window.Signal.Data.updateConversation(this.attributes);
     }
   }

ts/models/messages.ts

@@ -2575,6 +2575,14 @@ export class MessageModel extends window.Backbone.Model<MessageAttributesType> {
           );
         }
 
+        const ourPNI = window.textsecure.storage.user.getCheckedUuid(
+          UUIDKind.PNI
+        );
+        const ourUuids: Set<string> = new Set([
+          ourACI.toString(),
+          ourPNI.toString(),
+        ]);
+
         message.set({
           id: messageId,
           attachments: dataMessage.attachments,
@@ -2590,6 +2598,12 @@ export class MessageModel extends window.Backbone.Model<MessageAttributesType> {
           hasFileAttachments: dataMessage.hasFileAttachments,
           hasVisualMediaAttachments: dataMessage.hasVisualMediaAttachments,
           isViewOnce: Boolean(dataMessage.isViewOnce),
+          mentionsMe: (dataMessage.bodyRanges ?? []).some(bodyRange => {
+            if (!BodyRange.isMention(bodyRange)) {
+              return false;
+            }
+            return ourUuids.has(bodyRange.mentionUuid);
+          }),
           preview,
           requiredProtocolVersion:
             dataMessage.requiredProtocolVersion ||