Check errorMessages by id

app/src/main/kotlin/com/google/samples/apps/nowinandroid/ui/NiaApp.kt

@@ -108,13 +108,13 @@ fun NiaApp(appState: NiaAppState, modifier: Modifier = Modifier) {
             LaunchedEffect(errorMessage) {
                 errorMessage?.let {
                     val snackBarResult = snackbarHostState.showSnackbar(
-                        message = it,
+                        message = it.message,
                         actionLabel = "Continue",
                         duration = Indefinite,
                     ) == ActionPerformed
 
                     if (snackBarResult) {
-                        appState.clearErrorMessage()
+                        appState.clearErrorMessage(it.id)
                     }
                 }
             }

app/src/main/kotlin/com/google/samples/apps/nowinandroid/ui/NiaAppState.kt

@@ -121,17 +121,22 @@ class NiaAppState(
         )
 
     private val errorMessages = MutableStateFlow<List<ErrorMessage>>(emptyList())
-    val errorMessage: StateFlow<String?> = errorMessages.map { it.filter { it.message.isNotEmpty() && it.message.isNotBlank() }.firstOrNull()?.message }.stateIn(
+    val errorMessage: StateFlow<ErrorMessage?> = errorMessages.map { it.firstOrNull() }.stateIn(
         scope = coroutineScope,
         started = SharingStarted.WhileSubscribed(5_000),
         initialValue = null,
     )
-    fun addErrorMessage(error: String) {
-        if(error.isNotEmpty() && error.isNotBlank()) errorMessages.update { it + ErrorMessage(error) }
+    fun addErrorMessage(error: String): String? {
+        if(error.isNotBlank()) {
+            val newError = ErrorMessage(error)
+            errorMessages.update { it + newError }
+            return newError.id
+        }
+        return null
     }
 
-    fun clearErrorMessage() {
-        errorMessages.update { it.drop(1) }
+    fun clearErrorMessage(id: String) {
+        errorMessages.update { it.filter { item -> item.id != id } }
     }
 
     /**