fix(@desktop/chat): ensure replacement of mentions with pubkey works in communities

There were two issues why mentions didn't work in communities:

1. The function that replaces mentions with pubkey looked in the wrong place
2. The same function always prepented `userName` with `@` which isn't always necessary

This commit fix this by ensuring the replacement function looks in the community memberlist
instead of a messageList and also by checking if a `userName` already starts with a `@`
and only prepends it if not.

Fixes #3492

src/app/chat/views/community_members_list.nim

@@ -1,6 +1,7 @@
 import NimQml, Tables
 import status/[chat/chat, ens, status, settings]
 import status/types/[setting, status_update]
+import user_list
 
 type
   CommunityMembersRoles {.pure.} = enum
@@ -100,6 +101,11 @@ QtObject:
     if self.community.memberStatus.hasKey(pk):
       result = self.community.memberStatus[pk].statusType.int == StatusUpdateType.Online.int
 
+  proc getUserFromPubKey*(self: CommunityMembersView, pk: string): User =
+    let alias = self.alias(pk)
+    let userName = self.userName(pk, alias)
+    result = User(alias: alias, userName: userName)
+
   proc sortKey(self: CommunityMembersView, pk: string): string =
     let name = self.userName(pk, self.alias(pk))
     if self.isOnline(pk):

src/app/chat/views/messages.nim

@@ -9,7 +9,7 @@ import ../../../app_service/[main]
 import ../../../app_service/tasks/[qt, threadpool]
 import ../../../app_service/tasks/marathon/mailserver/worker
 
-import communities, chat_item, channels_list, communities, message_list, channel, message_item
+import communities, chat_item, channels_list, communities, community_list, user_list, community_members_list, message_list, channel, message_item
 
 logScope:
   topics = "messages-view"
@@ -76,8 +76,22 @@ QtObject:
     let nameMentions = findAll(message, namePattern)
     var updatedMessage = message
 
-    for publicKey in self.messageList[self.channelView.activeChannel.id].userList.users:
-      let user = self.messageList[self.channelView.activeChannel.id].userList.userDetails[publicKey]
+    var userList = self.messageList[self.channelView.activeChannel.id].userList.users
+
+    if self.communities.activeCommunity.active:
+      userList = self.communities.activeCommunity.members.community.members
+
+    for publicKey in userList:
+      
+      var user = if self.communities.activeCommunity.active:
+        self.communities.activeCommunity.members.getUserFromPubKey(publicKey)
+      else:
+        self.messageList[self.channelView.activeChannel.id].userList.userDetails[publicKey]
+
+      let userName = if user.userName.startsWith('@'):
+        user.userName
+      else:
+        "@" & user.userName
 
       for mention in aliasMentions:
         if "@" & user.alias.toLowerAscii != mention.toLowerAscii:
@@ -86,13 +100,13 @@ QtObject:
         updatedMessage = updatedMessage.replaceWord(mention, '@' & publicKey)
 
       for mention in ensMentions:
-        if "@" & user.userName.toLowerAscii != mention.toLowerAscii:
+        if userName.toLowerAscii != mention.toLowerAscii:
           continue
 
         updatedMessage = updatedMessage.replaceWord(mention, '@' & publicKey)
 
       for mention in nameMentions:
-        if "@" & user.userName.split(".")[0].toLowerAscii != mention.toLowerAscii:
+        if userName.split(".")[0].toLowerAscii != mention.toLowerAscii:
           continue
 
         updatedMessage = updatedMessage.replaceWord(mention, '@' & publicKey)

src/app/chat/views/user_list.nim

@@ -17,7 +17,7 @@ type
     LocalName = UserRole + 5
     Identicon = UserRole + 6
 
-  User = object
+  User* = object
     username*: string
     alias*: string
     localName: string