Fix clear completed from recently modified filter

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

@@ -1,6 +1,7 @@
 package com.todoroo.astrid.service;
 
 import static org.tasks.db.DbUtils.collect;
+import static org.tasks.db.QueryUtils.removeOrder;
 import static org.tasks.db.QueryUtils.showHiddenAndCompleted;
 
 import com.google.common.collect.ImmutableList;
@@ -87,7 +88,8 @@ public class TaskDeleter {
   public int clearCompleted(Filter filter) {
     List<Long> completed = new ArrayList<>();
     Filter deleteFilter = new Filter(null, null);
-    deleteFilter.setFilterQueryOverride(showHiddenAndCompleted(filter.getOriginalSqlQuery()));
+    deleteFilter.setFilterQueryOverride(
+        removeOrder(showHiddenAndCompleted(filter.getOriginalSqlQuery())));
     List<TaskContainer> tasks =
         taskDao.fetchTasks(
             (includeGoogleSubtasks, includeCaldavSubtasks) ->

app/src/main/java/org/tasks/db/QueryUtils.java

@@ -12,6 +12,9 @@ public class QueryUtils {
 
   private static final Pattern UNCOMPLETED = Pattern.compile("tasks\\.completed<?=0");
 
+  private static final Pattern ORDER =
+      Pattern.compile("order by .*? (asc|desc)", Pattern.CASE_INSENSITIVE);
+
   public static String showHidden(String query) {
     return HIDDEN.matcher(query).replaceAll("1");
   }
@@ -33,4 +36,8 @@ public class QueryUtils {
                     Task.COMPLETION_DATE.gte(DateUtilities.now() - 59999))
                 .toString());
   }
+
+  public static String removeOrder(String query) {
+    return ORDER.matcher(query).replaceAll("");
+  }
 }