android, desktop: refactoring to use mutex when updating chats (#4541)

* moving to mutablestate + snapshotstatelist from snapshotstatelist

* android, desktop: refactoring to use mutex when updating chats

* wrapped into class instead of object

* fix

---------

Co-authored-by: Evgeny Poberezkin <evgeny@poberezkin.com>

apps/multiplatform/android/src/main/java/chat/simplex/app/SimplexApp.kt

@@ -18,7 +18,7 @@ import chat.simplex.app.views.call.CallActivity
 import chat.simplex.common.helpers.*
 import chat.simplex.common.model.*
 import chat.simplex.common.model.ChatController.appPrefs
-import chat.simplex.common.model.ChatModel.updatingChatsMutex
+import chat.simplex.common.model.ChatModel.withChats
 import chat.simplex.common.platform.*
 import chat.simplex.common.ui.theme.CurrentColors
 import chat.simplex.common.ui.theme.DefaultTheme
@@ -27,7 +27,6 @@ import chat.simplex.common.views.helpers.*
 import chat.simplex.common.views.onboarding.OnboardingStage
 import com.jakewharton.processphoenix.ProcessPhoenix
 import kotlinx.coroutines.*
-import kotlinx.coroutines.sync.withLock
 import java.io.*
 import java.util.*
 import java.util.concurrent.TimeUnit
@@ -86,7 +85,7 @@ class SimplexApp: Application(), LifecycleEventObserver {
         Lifecycle.Event.ON_START -> {
           isAppOnForeground = true
           if (chatModel.chatRunning.value == true) {
-            updatingChatsMutex.withLock {
+            withChats {
               kotlin.runCatching {
                 val currentUserId = chatModel.currentUser.value?.userId
                 val chats = ArrayList(chatController.apiGetChats(chatModel.remoteHostId()))
@@ -99,7 +98,7 @@ class SimplexApp: Application(), LifecycleEventObserver {
                     /** Pass old chatStats because unreadCounter can be changed already while [ChatController.apiGetChats] is executing */
                     if (indexOfCurrentChat >= 0) chats[indexOfCurrentChat] = chats[indexOfCurrentChat].copy(chatStats = oldStats)
                   }
-                  chatModel.updateChats(chats)
+                  updateChats(chats)
                 }
               }.onFailure { Log.e(TAG, it.stackTraceToString()) }
             }