android, desktop: keep a channel being created from replacing members

The members of a channel being created were kept in the same list as the
open chat's members, so while a channel was being created with a group
open (on desktop, next to it; on Android, a group opened from a
notification during the creation), the group's info listed the
channel's relays as its members, and kept them until the info was shown
again, on desktop also after the creation was cancelled.

Keep the members of the channel being created in their own list, which
the creation screen reads for relay connection errors.

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

@@ -167,6 +167,7 @@ object ChatModel {
   // rhId, chatId
   val deletedChats = mutableStateOf<List<Pair<Long?, String>>>(emptyList())
   val creatingChannelId = mutableStateOf<String?>(null)
+  val creatingChannelMembers = mutableStateOf<List<GroupMember>>(emptyList())
   val groupMembers = mutableStateOf<List<GroupMember>>(emptyList())
   val groupMembersIndexes = mutableStateOf<Map<Long, Int>>(emptyMap())
   val membersLoaded = mutableStateOf(false)
@@ -981,8 +982,10 @@ object ChatModel {
         updateGroup(rhId, groupInfo)
         return false
       }
-      // update current chat or channel being created
-      return if (chatId.value == groupInfo.id || creatingChannelId.value == groupInfo.id) {
+      if (creatingChannelId.value == groupInfo.id) {
+        creatingChannelMembers.value = creatingChannelMembers.value.filter { it.groupMemberId != member.groupMemberId } + member
+      }
+      return if (chatId.value == groupInfo.id) {
         if (groupMembers.value.isNotEmpty() && groupMembers.value.firstOrNull()?.groupId != groupInfo.groupId) {
           // stale data, should be cleared at that point, otherwise, duplicated items will be here which will produce crashes in LazyColumn
           groupMembers.value = emptyList()

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

@@ -141,6 +141,7 @@ fun AddChannelView(chatModel: ChatModel, rh: RemoteHostInfo?, close: () -> Unit,
               is ChatController.PublicGroupCreationResult.Created -> {
                 withContext(Dispatchers.Main) {
                   chatModel.chatsContext.updateGroup(rhId = rhId, result.groupInfo)
+                  chatModel.creatingChannelMembers.value = emptyList()
                   chatModel.creatingChannelId.value = result.groupInfo.id
                   groupInfo.value = result.groupInfo
                   groupLink.value = result.groupLink
@@ -536,7 +537,7 @@ private fun ProgressStepView(
 }
 
 private fun relayMemberConnFailed(chatModel: ChatModel, relay: GroupRelay): String? {
-  return chatModel.groupMembers.value
+  return chatModel.creatingChannelMembers.value
     .firstOrNull { it.groupMemberId == relay.groupMemberId }
     ?.activeConn?.connFailedErr
 }