Correct StateFlow not updating with new List

Because the actual List pointer is the same,
 there is no difference between the value sent to emit and the
 value still in the StateFlow.

To correct this,
 A new list is created by appending an immutable list
 with the new value, which is then saved internally and emitted.

In response to work done:
streetcomplete#5482

app/src/main/java/de/westnordost/streetcomplete/screens/about/LogsViewModelImpl.kt

@@ -59,14 +59,14 @@ class LogsViewModelImpl(
         filters.transformLatest { filters ->
             // get prior logs into a backing state
             // There will be duplication regardless.
-            val logs = ArrayList(logsController.getLogs(filters))
+            var logs: List<LogMessage> = logsController.getLogs(filters)
 
             // emit the logs for the first view
             emit(logs)
 
             // start listening to new logs
             getIncomingLogs(filters).collect {
-                logs.add(it)
+                logs = logs + it
                 emit(logs)
             }
         }.stateIn(viewModelScope + Dispatchers.IO, SharingStarted.Eagerly, emptyList())