[TW-1783] Deleting recurring tasks reports wrong number of affected

[taskwarrior]

Daniel Shahaf on 2016-03-18T17:33:36Z says:

In the following, task reports Deleted 8 tasks, although only six tasks were deleted: tasks #2 through #7.

The use of "recur every second" is to force a situation with two outstanding instances of a recurring task.

Seven tasks aren't needed for this; it should be reproducible with a single recurring task with two instances.

% task add one due:1s recur:1s                                                              
Created task 1 (recurrence template).
% task all

ID St UUID     Age R Due        Description
 2 P  8fc066d1 -   R 2016-03-18 one        
 3 P  3d31d3ac -   R 2016-03-18 one        
 4 P  a9a8827f -   R 2016-03-18 one        
 5 P  94c49773 -   R 2016-03-18 one        
 6 P  de8cbfe1 -   R 2016-03-18 one        
 7 P  8b4ee5b5 -   R 2016-03-18 one        
 1 R  0623ebe1 5s  R 2016-03-18 one        

7 tasks
Creating recurring task instance 'one'
% task 2,3,4 delete
Delete task 2 'one'? (yes/no/all/quit) all
Deleting task 2 'one'.
This is a recurring task.  Do you want to delete all pending recurrences of this same task? (yes/no) yes
Deleting recurring task 3 'one'.
Deleting recurring task 4 'one'.
Deleting recurring task 5 'one'.
Deleting recurring task 6 'one'.
Deleting recurring task 7 'one'.
Deleting task 3 'one'.
This is a recurring task.  Do you want to delete all pending recurrences of this same task? (yes/no) yes
Deleting task 4 'one'.
This is a recurring task.  Do you want to delete all pending recurrences of this same task? (yes/no) yes
Deleted 8 tasks.

[taskwarrior]

Migrated metadata:

Created: 2016-03-18T17:33:36Z
Modified: 2017-01-16T21:17:59Z