count correctly tasks with a given tags in workview mode

[Lionel Dricot]

1) Create a task "to do now at home" and tag it @home

2) create a task "to do someday at home" and tag it @home and @someday

3) Right click on @someday and hide it from the workview

4) Switch to workview

Result :

@home displays that it contains two items (the two tasks)
but, when you click on it, you only see the first one (the second is hidden because of workview mode)

We should have a good count of the tasks that will be displayed

[Lionel Dricot (ploum-deactivatedaccount)]

Maybe it could be fixed for 0.2 as this is a rather a serious issue.

[Lionel Dricot (ploum-deactivatedaccount)]

fixed in rev. 456.

Please test extensively by checking if the count of the tasks is valid.