where is the difference to taskEdit? / #3789

If you are a any page that features a taskEdit function (e.g. projViewTasks), you can jump to taskEdit with an "From" Handle. Finally , after taskEdit and taskEditSubmit, $PH->showFromPage() is called, which displays projViewTasks again.

Although adding Arrays to Arrays would work under normal conditions, it will fail here, because the attributes are stored in the _tmp-dir with the From handle as hash key. The attributes are stored in a flat URL list like...

 go=projViewTasks&tsk=23&display=normal

This does not allow hierarchical structures.