Fix random reminder issues

app/src/main/java/com/todoroo/astrid/ui/RandomReminderControlSet.kt

@@ -41,10 +41,15 @@ internal class RandomReminderControlSet(context: Context, parentView: View, remi
         periodSpinner.adapter = adapter
         periodSpinner.onItemSelectedListener = object : OnItemSelectedListener {
             override fun onItemSelected(parent: AdapterView<*>?, view: View?, position: Int, id: Long) {
-                vm.selectedAlarms?.removeIf { it.type == TYPE_RANDOM }
-                vm.selectedAlarms?.add(
+                val newAlarm =
                     Alarm(vm.task?.id ?: 0, hours[position] * DateUtilities.ONE_HOUR, TYPE_RANDOM)
-                )
+                vm.selectedAlarms?.apply {
+                    find { it.type == TYPE_RANDOM }?.let {
+                        newAlarm.id = it.id
+                        remove(it)
+                    }
+                    add(newAlarm)
+                }
             }
 
             override fun onNothingSelected(parent: AdapterView<*>?) {}

app/src/main/java/org/tasks/ui/TaskEditViewModel.kt

@@ -35,6 +35,7 @@ import org.tasks.R
 import org.tasks.Strings
 import org.tasks.calendars.CalendarEventProvider
 import org.tasks.data.Alarm
+import org.tasks.data.Alarm.Companion.TYPE_RANDOM
 import org.tasks.data.Alarm.Companion.TYPE_REL_END
 import org.tasks.data.Alarm.Companion.TYPE_REL_START
 import org.tasks.data.Alarm.Companion.whenDue
@@ -108,6 +109,9 @@ class TaskEditViewModel @Inject constructor(
                     if (task.isNotifyAfterDeadline) {
                         add(whenOverdue(0))
                     }
+                    if (task.randomReminder > 0) {
+                        add(Alarm(0, task.randomReminder, TYPE_RANDOM))
+                    }
                 }
             } else {
                 alarms