prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  [Mod] Bot doesn't record name changes correctly
  # Other bugs
  
  #### What were you trying to do?
  
  Check past names using `[p]names` command
  
  #### What were you expecting to happen?
  
  Get past names
  
  #### What actually happened?
  
  I didn't get any names, because we're checking for it in wrong event (`on_member_update` instead of `on_user_update`).
  
  #### How can we reproduce this issue?
  
  1. Load mod cog
  2. Change username
  3. Use `[p]names` on yourself.
  
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `redbot/cogs/mod/events.py`
  Content:
  ```
  1 import logging
  2 from datetime import datetime
  3 from collections import defaultdict, deque
  4 
  5 import discord
  6 from redbot.core import i18n, modlog, commands
  7 from redbot.core.utils.mod import is_mod_or_superior
  8 from .abc import MixinMeta
  9 
  10 _ = i18n.Translator("Mod", __file__)
  11 log = logging.getLogger("red.mod")
  12 
  13 
  14 class Events(MixinMeta):
  15     """
  16     This is a mixin for the core mod cog
  17     Has a bunch of things split off to here.
  18     """
  19 
  20     async def check_duplicates(self, message):
  21         guild = message.guild
  22         author = message.author
  23 
  24         guild_cache = self.cache.get(guild.id, None)
  25         if guild_cache is None:
  26             repeats = await self.settings.guild(guild).delete_repeats()
  27             if repeats == -1:
  28                 return False
  29             guild_cache = self.cache[guild.id] = defaultdict(lambda: deque(maxlen=repeats))
  30 
  31         if not message.content:
  32             return False
  33 
  34         guild_cache[author].append(message.content)
  35         msgs = guild_cache[author]
  36         if len(msgs) == msgs.maxlen and len(set(msgs)) == 1:
  37             try:
  38                 await message.delete()
  39                 return True
  40             except discord.HTTPException:
  41                 pass
  42         return False
  43 
  44     async def check_mention_spam(self, message):
  45         guild = message.guild
  46         author = message.author
  47 
  48         max_mentions = await self.settings.guild(guild).ban_mention_spam()
  49         if max_mentions:
  50             mentions = set(message.mentions)
  51             if len(mentions) >= max_mentions:
  52                 try:
  53                     await guild.ban(author, reason=_("Mention spam (Autoban)"))
  54                 except discord.HTTPException:
  55                     log.info(
  56                         "Failed to ban member for mention spam in server {}.".format(guild.id)
  57                     )
  58                 else:
  59                     try:
  60                         await modlog.create_case(
  61                             self.bot,
  62                             guild,
  63                             message.created_at,
  64                             "ban",
  65                             author,
  66                             guild.me,
  67                             _("Mention spam (Autoban)"),
  68                             until=None,
  69                             channel=None,
  70                         )
  71                     except RuntimeError as e:
  72                         print(e)
  73                         return False
  74                     return True
  75         return False
  76 
  77     @commands.Cog.listener()
  78     async def on_message(self, message):
  79         author = message.author
  80         if message.guild is None or self.bot.user == author:
  81             return
  82         valid_user = isinstance(author, discord.Member) and not author.bot
  83         if not valid_user:
  84             return
  85 
  86         #  Bots and mods or superior are ignored from the filter
  87         mod_or_superior = await is_mod_or_superior(self.bot, obj=author)
  88         if mod_or_superior:
  89             return
  90         # As are anyone configured to be
  91         if await self.bot.is_automod_immune(message):
  92             return
  93         deleted = await self.check_duplicates(message)
  94         if not deleted:
  95             await self.check_mention_spam(message)
  96 
  97     @commands.Cog.listener()
  98     async def on_member_update(self, before: discord.Member, after: discord.Member):
  99         if before.name != after.name:
  100             async with self.settings.user(before).past_names() as name_list:
  101                 while None in name_list:  # clean out null entries from a bug
  102                     name_list.remove(None)
  103                 if after.name in name_list:
  104                     # Ensure order is maintained without duplicates occuring
  105                     name_list.remove(after.name)
  106                 name_list.append(after.name)
  107                 while len(name_list) > 20:
  108                     name_list.pop(0)
  109 
  110         if before.nick != after.nick and after.nick is not None:
  111             async with self.settings.member(before).past_nicks() as nick_list:
  112                 while None in nick_list:  # clean out null entries from a bug
  113                     nick_list.remove(None)
  114                 if after.nick in nick_list:
  115                     nick_list.remove(after.nick)
  116                 nick_list.append(after.nick)
  117                 while len(nick_list) > 20:
  118                     nick_list.pop(0)
  119
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/redbot/cogs/mod/events.py b/redbot/cogs/mod/events.py
  --- a/redbot/cogs/mod/events.py
  +++ b/redbot/cogs/mod/events.py
  @@ -95,7 +95,7 @@
               await self.check_mention_spam(message)
   
       @commands.Cog.listener()
  -    async def on_member_update(self, before: discord.Member, after: discord.Member):
  +    async def on_user_update(self, before: discord.User, after: discord.User):
           if before.name != after.name:
               async with self.settings.user(before).past_names() as name_list:
                   while None in name_list:  # clean out null entries from a bug
  @@ -107,6 +107,8 @@
                   while len(name_list) > 20:
                       name_list.pop(0)
   
  +    @commands.Cog.listener()
  +    async def on_member_update(self, before: discord.Member, after: discord.Member):
           if before.nick != after.nick and after.nick is not None:
               async with self.settings.member(before).past_nicks() as nick_list:
                   while None in nick_list:  # clean out null entries from a bug
  
verification_info: {"golden_diff": "diff --git a/redbot/cogs/mod/events.py b/redbot/cogs/mod/events.py\n--- a/redbot/cogs/mod/events.py\n+++ b/redbot/cogs/mod/events.py\n@@ -95,7 +95,7 @@\n             await self.check_mention_spam(message)\n \n     @commands.Cog.listener()\n-    async def on_member_update(self, before: discord.Member, after: discord.Member):\n+    async def on_user_update(self, before: discord.User, after: discord.User):\n         if before.name != after.name:\n             async with self.settings.user(before).past_names() as name_list:\n                 while None in name_list:  # clean out null entries from a bug\n@@ -107,6 +107,8 @@\n                 while len(name_list) > 20:\n                     name_list.pop(0)\n \n+    @commands.Cog.listener()\n+    async def on_member_update(self, before: discord.Member, after: discord.Member):\n         if before.nick != after.nick and after.nick is not None:\n             async with self.settings.member(before).past_nicks() as nick_list:\n                 while None in nick_list:  # clean out null entries from a bug\n", "issue": "[Mod] Bot doesn't record name changes correctly\n# Other bugs\r\n\r\n#### What were you trying to do?\r\n\r\nCheck past names using `[p]names` command\r\n\r\n#### What were you expecting to happen?\r\n\r\nGet past names\r\n\r\n#### What actually happened?\r\n\r\nI didn't get any names, because we're checking for it in wrong event (`on_member_update` instead of `on_user_update`).\r\n\r\n#### How can we reproduce this issue?\r\n\r\n1. Load mod cog\r\n2. Change username\r\n3. Use `[p]names` on yourself.\r\n\n", "before_files": [{"content": "import logging\nfrom datetime import datetime\nfrom collections import defaultdict, deque\n\nimport discord\nfrom redbot.core import i18n, modlog, commands\nfrom redbot.core.utils.mod import is_mod_or_superior\nfrom .abc import MixinMeta\n\n_ = i18n.Translator(\"Mod\", __file__)\nlog = logging.getLogger(\"red.mod\")\n\n\nclass Events(MixinMeta):\n    \"\"\"\n    This is a mixin for the core mod cog\n    Has a bunch of things split off to here.\n    \"\"\"\n\n    async def check_duplicates(self, message):\n        guild = message.guild\n        author = message.author\n\n        guild_cache = self.cache.get(guild.id, None)\n        if guild_cache is None:\n            repeats = await self.settings.guild(guild).delete_repeats()\n            if repeats == -1:\n                return False\n            guild_cache = self.cache[guild.id] = defaultdict(lambda: deque(maxlen=repeats))\n\n        if not message.content:\n            return False\n\n        guild_cache[author].append(message.content)\n        msgs = guild_cache[author]\n        if len(msgs) == msgs.maxlen and len(set(msgs)) == 1:\n            try:\n                await message.delete()\n                return True\n            except discord.HTTPException:\n                pass\n        return False\n\n    async def check_mention_spam(self, message):\n        guild = message.guild\n        author = message.author\n\n        max_mentions = await self.settings.guild(guild).ban_mention_spam()\n        if max_mentions:\n            mentions = set(message.mentions)\n            if len(mentions) >= max_mentions:\n                try:\n                    await guild.ban(author, reason=_(\"Mention spam (Autoban)\"))\n                except discord.HTTPException:\n                    log.info(\n                        \"Failed to ban member for mention spam in server {}.\".format(guild.id)\n                    )\n                else:\n                    try:\n                        await modlog.create_case(\n                            self.bot,\n                            guild,\n                            message.created_at,\n                            \"ban\",\n                            author,\n                            guild.me,\n                            _(\"Mention spam (Autoban)\"),\n                            until=None,\n                            channel=None,\n                        )\n                    except RuntimeError as e:\n                        print(e)\n                        return False\n                    return True\n        return False\n\n    @commands.Cog.listener()\n    async def on_message(self, message):\n        author = message.author\n        if message.guild is None or self.bot.user == author:\n            return\n        valid_user = isinstance(author, discord.Member) and not author.bot\n        if not valid_user:\n            return\n\n        #  Bots and mods or superior are ignored from the filter\n        mod_or_superior = await is_mod_or_superior(self.bot, obj=author)\n        if mod_or_superior:\n            return\n        # As are anyone configured to be\n        if await self.bot.is_automod_immune(message):\n            return\n        deleted = await self.check_duplicates(message)\n        if not deleted:\n            await self.check_mention_spam(message)\n\n    @commands.Cog.listener()\n    async def on_member_update(self, before: discord.Member, after: discord.Member):\n        if before.name != after.name:\n            async with self.settings.user(before).past_names() as name_list:\n                while None in name_list:  # clean out null entries from a bug\n                    name_list.remove(None)\n                if after.name in name_list:\n                    # Ensure order is maintained without duplicates occuring\n                    name_list.remove(after.name)\n                name_list.append(after.name)\n                while len(name_list) > 20:\n                    name_list.pop(0)\n\n        if before.nick != after.nick and after.nick is not None:\n            async with self.settings.member(before).past_nicks() as nick_list:\n                while None in nick_list:  # clean out null entries from a bug\n                    nick_list.remove(None)\n                if after.nick in nick_list:\n                    nick_list.remove(after.nick)\n                nick_list.append(after.nick)\n                while len(nick_list) > 20:\n                    nick_list.pop(0)\n", "path": "redbot/cogs/mod/events.py"}], "after_files": [{"content": "import logging\nfrom datetime import datetime\nfrom collections import defaultdict, deque\n\nimport discord\nfrom redbot.core import i18n, modlog, commands\nfrom redbot.core.utils.mod import is_mod_or_superior\nfrom .abc import MixinMeta\n\n_ = i18n.Translator(\"Mod\", __file__)\nlog = logging.getLogger(\"red.mod\")\n\n\nclass Events(MixinMeta):\n    \"\"\"\n    This is a mixin for the core mod cog\n    Has a bunch of things split off to here.\n    \"\"\"\n\n    async def check_duplicates(self, message):\n        guild = message.guild\n        author = message.author\n\n        guild_cache = self.cache.get(guild.id, None)\n        if guild_cache is None:\n            repeats = await self.settings.guild(guild).delete_repeats()\n            if repeats == -1:\n                return False\n            guild_cache = self.cache[guild.id] = defaultdict(lambda: deque(maxlen=repeats))\n\n        if not message.content:\n            return False\n\n        guild_cache[author].append(message.content)\n        msgs = guild_cache[author]\n        if len(msgs) == msgs.maxlen and len(set(msgs)) == 1:\n            try:\n                await message.delete()\n                return True\n            except discord.HTTPException:\n                pass\n        return False\n\n    async def check_mention_spam(self, message):\n        guild = message.guild\n        author = message.author\n\n        max_mentions = await self.settings.guild(guild).ban_mention_spam()\n        if max_mentions:\n            mentions = set(message.mentions)\n            if len(mentions) >= max_mentions:\n                try:\n                    await guild.ban(author, reason=_(\"Mention spam (Autoban)\"))\n                except discord.HTTPException:\n                    log.info(\n                        \"Failed to ban member for mention spam in server {}.\".format(guild.id)\n                    )\n                else:\n                    try:\n                        await modlog.create_case(\n                            self.bot,\n                            guild,\n                            message.created_at,\n                            \"ban\",\n                            author,\n                            guild.me,\n                            _(\"Mention spam (Autoban)\"),\n                            until=None,\n                            channel=None,\n                        )\n                    except RuntimeError as e:\n                        print(e)\n                        return False\n                    return True\n        return False\n\n    @commands.Cog.listener()\n    async def on_message(self, message):\n        author = message.author\n        if message.guild is None or self.bot.user == author:\n            return\n        valid_user = isinstance(author, discord.Member) and not author.bot\n        if not valid_user:\n            return\n\n        #  Bots and mods or superior are ignored from the filter\n        mod_or_superior = await is_mod_or_superior(self.bot, obj=author)\n        if mod_or_superior:\n            return\n        # As are anyone configured to be\n        if await self.bot.is_automod_immune(message):\n            return\n        deleted = await self.check_duplicates(message)\n        if not deleted:\n            await self.check_mention_spam(message)\n\n    @commands.Cog.listener()\n    async def on_user_update(self, before: discord.User, after: discord.User):\n        if before.name != after.name:\n            async with self.settings.user(before).past_names() as name_list:\n                while None in name_list:  # clean out null entries from a bug\n                    name_list.remove(None)\n                if after.name in name_list:\n                    # Ensure order is maintained without duplicates occuring\n                    name_list.remove(after.name)\n                name_list.append(after.name)\n                while len(name_list) > 20:\n                    name_list.pop(0)\n\n    @commands.Cog.listener()\n    async def on_member_update(self, before: discord.Member, after: discord.Member):\n        if before.nick != after.nick and after.nick is not None:\n            async with self.settings.member(before).past_nicks() as nick_list:\n                while None in nick_list:  # clean out null entries from a bug\n                    nick_list.remove(None)\n                if after.nick in nick_list:\n                    nick_list.remove(after.nick)\n                nick_list.append(after.nick)\n                while len(nick_list) > 20:\n                    nick_list.pop(0)\n", "path": "redbot/cogs/mod/events.py"}]}