Finding linked messages in replies work now, resolves #2920

Author: fourjr

CHANGELOG.md

@@ -30,6 +30,7 @@ however, insignificant breaking changes do not guarantee a major version bump, s
 - `?blocked` now no longers show blocks that have expired.
 - Blocked roles will no longer trigger an error during unblock.
 - Custom emojis are now supported in `confirm_thread_creation_deny`. ([GH #2916](https://github.com/kyb3r/modmail/issues/2916))
+- Finding linked messages in replies work now. ([GH #2920](https://github.com/kyb3r/modmail/issues/2920), [Jerrie-Aries](https://github.com/kyb3r/modmail/issues/2920#issuecomment-751530495))
 
 ### Internal
 

core/thread.py

@@ -660,8 +660,10 @@ async def delete_message(
     async def find_linked_message_from_dm(self, message, either_direction=False):
         if either_direction and message.embeds:
             compare_url = message.embeds[0].author.url
+            compare_id = compare_url.split('#')[-1]
         else:
             compare_url = None
+            compare_id = None
 
         if self.channel is not None:
             async for linked_message in self.channel.history():
@@ -679,6 +681,11 @@ async def find_linked_message_from_dm(self, message, either_direction=False):
                 msg_id = int(msg_id)
                 if int(msg_id) == message.id:
                     return linked_message
+
+                if compare_id is not None and compare_id.isdigit():
+                    if int(msg_id) == int (compare_id):
+                        return linked_message
+
             raise ValueError("Thread channel message not found.")
 
     async def edit_dm_message(self, message: discord.Message, content: str) -> None: