Don't update completion date on subtasks

app/src/main/java/com/todoroo/astrid/service/TaskCompleter.java

@@ -1,10 +1,12 @@
 package com.todoroo.astrid.service;
 
+import static com.google.common.collect.Lists.newArrayList;
 import static com.todoroo.andlib.utility.DateUtilities.now;
-import static java.util.Collections.singletonList;
 
+import com.google.common.collect.Iterables;
 import com.todoroo.astrid.dao.TaskDao;
 import com.todoroo.astrid.data.Task;
+import java.util.Collections;
 import java.util.List;
 import javax.inject.Inject;
 import org.tasks.data.CaldavDao;
@@ -35,17 +37,23 @@ public class TaskCompleter {
 
   public void setComplete(Task item, boolean completed) {
     long completionDate = completed ? now() : 0L;
-    setComplete(singletonList(item), completionDate);
-    setComplete(googleTaskDao.getChildTasks(item.getId()), completionDate);
+    setComplete(Collections.singletonList(item), completionDate);
+    List<Task> tasks = newArrayList(googleTaskDao.getChildTasks(item.getId()));
     List<Long> caldavChildren = caldavDao.getChildren(item.getId());
     if (!caldavChildren.isEmpty()) {
-      setComplete(taskDao.fetch(caldavChildren), completionDate);
+      tasks.addAll(taskDao.fetch(caldavChildren));
     }
+    setComplete(
+        newArrayList(Iterables.filter(tasks, t -> t.isCompleted() != completed)), completionDate);
   }
 
   private void setComplete(List<Task> tasks, long completionDate) {
-    for (Task task : tasks) {
+    for (int i = 0; i < tasks.size(); i++) {
+      Task task = tasks.get(i);
       task.setCompletionDate(completionDate);
+      if (i < tasks.size() - 1) {
+        task.putTransitory(TaskDao.TRANS_SUPPRESS_REFRESH, true);
+      }
       taskDao.save(task);
     }
   }