Added get_reference_message helper

Author: Saber0324

bot/exts/info/tags.py

@@ -278,6 +278,20 @@ def accessible_tags_in_group(self, group: str, member: Member) -> list[str]:
             if identifier.group == group and tag.accessible_by(member)
         )
 
+    async def get_reference_message(self, ctx: Context) -> discord.Message | None:
+        """Return a message reference if the reference exists and it does not refer to the author of the message."""
+        if ctx.message.reference is None:
+            return None
+        try:
+            referenced_message = await ctx.fetch_message(ctx.message.reference.message_id)
+        except (discord.Forbidden, discord.NotFound):
+            referenced_message = None
+        if referenced_message is None:
+            return None
+        if referenced_message.author == ctx.author:
+            return None
+        return referenced_message
+
     async def get_command_ctx(
         self,
         ctx: Context,