Add task list to backstack, manually finish

src/main/java/com/todoroo/astrid/activity/TaskListActivity.java

@@ -178,6 +178,7 @@ public class TaskListActivity extends InjectingAppCompatActivity implements
         fragmentManager.popBackStackImmediate(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);
         fragmentManager.beginTransaction()
                 .replace(isDoublePaneLayout() ? R.id.master_dual : R.id.single_pane, taskListFragment, TaskListFragment.TAG_TASKLIST_FRAGMENT)
+                .addToBackStack(TaskListFragment.TAG_TASKLIST_FRAGMENT)
                 .commit();
     }
 
@@ -335,7 +336,7 @@ public class TaskListActivity extends InjectingAppCompatActivity implements
                 taskEditFragment.discardButtonClick();
             }
         } else if (!isFinishing()) {
-            super.onBackPressed();
+            finish();
         }
     }