Fix bug where non-public messages were forwarded

Author: dahlia

CHANGES.md

@@ -6,6 +6,9 @@ Version 0.1.1
 
 To be released.
 
+ -  Fixed a bug where direct and followers-only messages that reply to a bot
+    had been forwarded to the bot's followers.
+
 
 Version 0.1.0
 -------------

src/bot-impl.ts

@@ -633,7 +633,11 @@ export class BotImpl<TContextData> implements Bot<TContextData> {
       messageClasses.includes(replyTarget.class)
     ) {
       const message = await getMessage();
-      await ctx.forwardActivity(this, "followers");
+      if (
+        message.visibility === "public" || message.visibility === "unlisted"
+      ) {
+        await ctx.forwardActivity(this, "followers");
+      }
       await this.onReply(session, message);
     }
     for await (const tag of object.getTags(ctx)) {