Fixed concurrency errors when trying to update recent repositories

src/main/kotlin/app/AppStateManager.kt

@@ -1,6 +1,7 @@
 package app
 
 import kotlinx.coroutines.*
+import kotlinx.coroutines.sync.Mutex
 import kotlinx.serialization.decodeFromString
 import kotlinx.serialization.encodeToString
 import kotlinx.serialization.json.Json
@@ -11,6 +12,8 @@ import javax.inject.Singleton
 class AppStateManager @Inject constructor(
     private val appPreferences: AppPreferences,
 ) {
+    private val mutex = Mutex()
+
     private val _openRepositoriesPaths = mutableMapOf<Int, String>()
     val openRepositoriesPathsTabs: Map<Int, String>
         get() = _openRepositoriesPaths
@@ -25,6 +28,8 @@ class AppStateManager @Inject constructor(
         get() = _latestOpenedRepositoriesPaths.firstOrNull() ?: ""
 
     fun repositoryTabChanged(key: Int, path: String) = appStateScope.launch(Dispatchers.IO) {
+        mutex.lock()
+        try {
             // Do not save already saved repos
             if (!_openRepositoriesPaths.containsValue(path))
                 _openRepositoriesPaths[key] = path
@@ -40,6 +45,9 @@ class AppStateManager @Inject constructor(
 
             updateSavedRepositoryTabs()
             updateLatestRepositoryTabs()
+        } finally {
+            mutex.unlock()
+        }
     }
 
     fun repositoryTabRemoved(key: Int) = appStateScope.launch(Dispatchers.IO) {