android: lookup group members via map (#4432)

apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/model/ChatModel.kt

@@ -65,6 +65,7 @@ object ChatModel {
   val deletedChats = mutableStateOf<List<Pair<Long?, String>>>(emptyList())
   val chatItemStatuses = mutableMapOf<Long, CIStatus>()
   val groupMembers = mutableStateListOf<GroupMember>()
+  val groupMembersIndexes = mutableStateMapOf<Long, Int>()
 
   val terminalItems = mutableStateOf<List<TerminalItem>>(listOf())
   val userAddress = mutableStateOf<UserContactLinkRec?>(null)
@@ -170,7 +171,23 @@ object ChatModel {
   fun getChat(id: String): Chat? = chats.toList().firstOrNull { it.id == id }
   fun getContactChat(contactId: Long): Chat? = chats.toList().firstOrNull { it.chatInfo is ChatInfo.Direct && it.chatInfo.apiId == contactId }
   fun getGroupChat(groupId: Long): Chat? = chats.toList().firstOrNull { it.chatInfo is ChatInfo.Group && it.chatInfo.apiId == groupId }
-  fun getGroupMember(groupMemberId: Long): GroupMember? = groupMembers.firstOrNull { it.groupMemberId == groupMemberId }
+
+  fun populateGroupMembersIndexes() {
+    groupMembersIndexes.clear()
+    groupMembers.forEachIndexed { i, member ->
+      groupMembersIndexes[member.groupMemberId] = i
+    }
+  }
+
+  fun getGroupMember(groupMemberId: Long): GroupMember? {
+    val memberIndex = groupMembersIndexes[groupMemberId]
+    return if (memberIndex != null) {
+      groupMembers[memberIndex]
+    } else {
+      null
+    }
+  }
+
   private fun getChatIndex(rhId: Long?, id: String): Int = chats.toList().indexOfFirst { it.id == id && it.remoteHostId == rhId }
   fun addChat(chat: Chat) = chats.add(index = 0, chat)
 
@@ -620,12 +637,13 @@ object ChatModel {
     }
     // update current chat
     return if (chatId.value == groupInfo.id) {
-      val memberIndex = groupMembers.indexOfFirst { it.groupMemberId == member.groupMemberId }
-      if (memberIndex >= 0) {
+      val memberIndex = groupMembersIndexes[member.groupMemberId]
+      if (memberIndex != null) {
         groupMembers[memberIndex] = member
         false
       } else {
         groupMembers.add(member)
+        groupMembersIndexes[member.groupMemberId] = groupMembers.size - 1
         true
       }
     } else {

apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/views/chat/ChatView.kt

@@ -159,6 +159,7 @@ fun ChatView(chatId: String, chatModel: ChatModel, onComposed: suspend (chatId:
               AudioPlayer.stop()
               chatModel.chatId.value = null
               chatModel.groupMembers.clear()
+              chatModel.groupMembersIndexes.clear()
             },
             info = {
               if (ModalManager.end.hasModalsOpen()) {

apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/views/chatlist/ChatListNavLinkView.kt

@@ -253,7 +253,9 @@ suspend fun setGroupMembers(rhId: Long?, groupInfo: GroupInfo, chatModel: ChatMo
     }
   }
   chatModel.groupMembers.clear()
+  chatModel.groupMembersIndexes.clear()
   chatModel.groupMembers.addAll(newMembers)
+  chatModel.populateGroupMembersIndexes()
 }
 
 @Composable