Copy only opened subtasks when copying an issue
I often use a task with several subtasks for a targeted version. If some subtasks don't get closed for that version I need to copy the parent task and all opened subtask in a new version.
In the copy task functionality could be useful have another flag (near copy subtasks) that do this.
If a task has a subtask closed and this one has a subtask opened all three task could be copied. Substantially wins the deepest opened subtask.