Sending message with embed triggers on_message_edit

[slysherz]

Summary

When the bot sends a message with an embed, it triggers on_message_edit.
If the message with the embed is sent by a user instead, it works correctly and on_message_edit doesn't trigger.

Reproduction Steps

1 - Run the bot

import discord

token = "???"
client = discord.Client()

@client.event
async def on_message(message):
    if message.author == client.user:
        return

    embed = discord.Embed()

    await message.channel.send(embed=embed)

@client.event
async def on_message_edit(before, after):
    print("message update!")

@client.event
async def on_ready():
    print("ready")

client.run(token)

2 - Send any message to the bot

Expected Results

on_message_edit should not trigger and message update! should not be printed.

Actual Results

ready
message update!

Checklist

• I have searched the open issues for duplicates.
• I have shown the entire traceback, if possible.
• I have removed my token from display, if visible.

System Information

Windows:

• Python v3.8.0-final
• discord.py v1.2.5-final
• aiohttp v3.5.4
• websockets v6.0
• system info: Windows 10 10.0.18362

Linux

• Python v3.7.5-final
• discord.py v1.2.5-final
• aiohttp v3.5.4
• websockets v6.0
• system info: Linux 5.3.0-2-amd64 Fix issue with author changing type #1 SMP Debian 5.3.9-3 (2019-11-19)

[Zomatree]

this is a intentional thing by discord

[slysherz]

Oh, okay. Do you know the reason for it, or do you have a link with more information?

[Zomatree]

it happens because that's how discord does embeds

[Rapptz]

Discord fires what's called an "embed-only edit" to update the embeds in the message of the links you posted in the chat. It's best to check the delta for things you care about, e.g. if before.content != after.content or something along those lines.

[slysherz]

Okay, I see. Thanks for your help guys : )